TWI451171B - Optical compensation film, polarizing plate and liquid crystal display device - Google Patents

Description

Optical compensation film, polarizing plate and liquid crystal display device

The present invention relates to an optical compensation film, a polarizing plate, and a liquid crystal display device. In particular, the present invention relates to a vertical alignment type liquid crystal display device, and an optical compensation film and a polarizing plate used in the liquid crystal display device.

Since the wide viewing angle liquid crystal display device using the VA mode has been put into practical use, the demand for liquid crystal display devices has been rapidly expanding in the market for high-quality images such as televisions.

Compared with other liquid crystal display modes, the VA mode liquid crystal display device generally has the advantage of so-called high contrast, but there is a problem that the contrast and the color taste change with the viewing angle. In this regard, for example, a method of using two types of retardation films having different optical characteristics has been disclosed, thereby providing a clear and achromatic VA mode liquid crystal display device even when viewed from an oblique direction in black display (for example, refer to International Publication No. 2003/032060 manual).

However, when the two types of retardation films are actually incorporated in a liquid crystal display device, most of them are incorporated in a liquid crystal display device integrally with a polarizing plate. However, in this case, after the polarizing plate is produced, it is necessary to have Two pieces of phase difference film showing predetermined optical characteristics are bonded together. Therefore, there are problems in that the manufacturing process becomes complicated, the productivity is lowered, the manufacturing cost is improved, and the like, and improvement is sought.

In this regard, an optical compensation film having a transparent support and an optically anisotropic layer formed of a discotic liquid crystalline molecule has been proposed as a VA mode liquid crystal, for example, in Japanese Laid-Open Patent Publication No. 2000-304931. An optical compensation film for a display device. By using a deuterated cellulose film as a transparent support, the deuterated cellulose film can be utilized as a protective film for a polarizing plate, and the above-mentioned productivity problem can be solved. However, in order to obtain optical characteristics necessary for optical compensation of the VA mode liquid crystal display device, it is necessary to make the thickness of the optical anisotropic layer to a certain extent, when the optical anisotropic layer is formed by coating. There will be problems with uneven coating. Further, Japanese Laid-Open Patent Publication No. 2005-128050 proposes a phase difference plate which can be used as an optical compensation for a liquid crystal display device or the like of a VA mode, and which has optically negative refractive index anisotropy and The absolute value of the refractive index optical anisotropy is 0.060 or more and 0.085 or less, and the Re value is -10 to 10 nm, and the discotic liquid crystal compound is substantially horizontally aligned with respect to the plate surface of the retardation plate. Phase difference plate.

Further, the retardation of the phase difference plate formed of a polymer film or the like is not the same with respect to any wavelength, but varies to some extent with the wavelength of the incident light (hereinafter, this property is called "Wavelength dispersion"). Among the polymer films, those having a wavelength dispersion which exhibits an increase in hysteresis when the wavelength of incident light is shortened (hereinafter referred to as "paradispersivity") and a wavelength at which hysteresis is decreased when the wavelength of incident light becomes shorter Dispersibility (hereinafter referred to as "reverse dispersion"). On the other hand, the liquid crystal cell also has wavelength dispersion in terms of birefringence, and in order to obtain more favorable optical compensation of the liquid crystal cell, the wavelength dispersion of the hysteresis of the phase difference plate may need to be similarly adjusted. For example, it is proposed to use a negative C plate for optical compensation in the black display of the VA mode liquid crystal cell, however, the wavelength dispersion of the retardation (Rth) in the thickness direction of the negative C plate is not similar to the wavelength dispersion of the VA mode liquid crystal cell. When there is a change in color with the viewing angle (some cases are called "color shift"). However, the polymer film which has been used as a phase difference plate of a VA mode liquid crystal cell is difficult to control the wavelength dispersion of hysteresis, and a phase difference plate which exhibits an ideal wavelength dispersion similar to the birefringence of a liquid crystal cell is produced. difficult. In particular, in the case of a polymer film, it is difficult to find an Rth which exhibits a certain absolute value, and the wavelength dispersion of the Rth is an optical property of dispersibility; therefore, even if an additive or the like is added for control, There is a problem that wavelength dispersion and Rth cannot be controlled at the same time. Further, when an optically anisotropic layer is formed on a polymer film to form an optical compensation film, the wavelength dispersibility of the optical anisotropic layer is inevitably lowered due to the wavelength dispersion of the polymer film, so that it is difficult to obtain Overall predetermined wavelength dispersion. Under such circumstances, it is therefore required to provide an optical compensation film having excellent optical compensation thinning ability for liquid crystal cells of various modes, particularly VA mode.

Further, in order to eliminate the reason that the polarizing plate of the vertical Nicol state which is mainly viewed from the oblique direction is not the appearance of the vertical state, a negative C is proposed on page 525 to 527 of IWD'02. The plate is combined with a method of using a reverse dispersion of the positive A plate. The positive A plate of the reverse dispersion like this is sold under the trade name of the pure auxiliary WR (Teijin Chemical Co., Ltd.).

An object of the present invention is to provide a novel optical compensation film useful for optical compensation of a VA mode liquid crystal display device, a polarizing plate, and a VA mode liquid crystal display device having improved viewing angle characteristics.

Further, as a result of research by the present inventors, it is understood that in the case of using the reverse dispersion of the positive A plate and the negative C plate to optically compensate the liquid crystal cell of the VA mode, in the case of the negative C plate, the hysteresis in the thickness direction is required. The smooth dispersion of the steeper slope than the wavelength dispersion of the liquid crystal used for the liquid crystal cell.

Therefore, the first aspect of the present invention provides an optical compensation film which is highly productive, has no or less optical characteristics and uneven film thickness, and can optically compensate liquid crystal cells, particularly VA mode liquid crystal cells, as The subject, as well as to provide a polarizing plate using it. Further, the first aspect of the present invention provides a display device which has no or little display unevenness due to an optical compensation film and which has excellent optical display compensation characteristics, and particularly provides a VA mode liquid crystal. The display device is a problem.

Moreover, as a result of research by the present inventors, it is understood that a polymer film which has been used as a phase difference plate of a liquid crystal cell of a VA mode is difficult to control the wavelength dispersion of hysteresis, thereby producing a birefringence wavelength which exhibits a liquid crystal cell. A phase difference plate having a dispersibility (usually a dispersibility) of wavelength dispersion with equal or steep slope is difficult, and in particular, in terms of a polymer film, it is difficult to find an Rth exhibiting a certain degree of absolute value. Further, the wavelength dispersion of the Rth is an optical property of dispersibility; therefore, even if an additive or the like is added for control, there is a problem that wavelength dispersion and Rth cannot be simultaneously controlled.

Accordingly, the second aspect of the present invention provides a sufficient Rth on a liquid crystal cell in optical compensation (for example, optical compensation in black display of a liquid crystal cell of a VA mode), and its wavelength dispersion is a smooth display. An optical compensation film that functions as a C-plate function, which is dispersible and can be stably manufactured, is a problem. Further, the second aspect of the present invention is also provided as a liquid crystal display device, and in particular, an optical compensation film and a polarizing plate which are useful for optical compensation of a liquid crystal display device of the VA mode and which are excellent in productivity. As a subject. Further, the second aspect of the present invention has been made to provide a liquid crystal display device in which the change in color gradation of viewing angle characteristics, particularly viewing angle dependence, has been reduced, and in particular, a liquid crystal display device having a VA mode has been proposed.

Moreover, the inventors have found out that when an optically anisotropic layer is continuously formed on a long support using a discotic liquid crystal, in order to obtain a desired optical characteristic (especially a high Rth value), a coating film is obtained. The thickness becomes thicker, so that the problem of uneven coating occurs.

Therefore, the third aspect of the present invention provides an optical compensation film which is not uneven and can optically compensate the liquid crystal cell correctly, and provides a polarizing plate and a liquid crystal display device using the optical compensation film. In order to solve the problem, in particular, a liquid crystal display device having a VA mode is provided as a subject.

The means for solving the above problems are as follows.

[1] An optical compensation film which is an optical compensation film having at least one layer of an optically anisotropic layer on a polymer film, having an in-plane retardation of 0 to 10 nm and a hysteresis of a thickness direction of 100 to 300 nm. And the foregoing film satisfies the following relationship (1-1) to (1-3); formula (1-1) - 50 nm ≦ Rth (590) ≦ 150 nm (1-2) - 5 nm ≦ Rth ( 450) - Rth (550) Formula (1-3) 0 ≦ Re (590) ≦ 10 nm.

[2] The optical compensation film of [1], wherein the film further satisfies the following relationship (1-4) to (1-5); and (1-4) 20 nm ≦ Rth (590) ≦ 120 Nm Formula (1-5) 1.0 < Rth (450) / Rth (550) < 4.0.

[3] The optical compensation film according to [1], wherein the film is a deuterated cellulose-based film mainly composed of deuterated cellulose.

[4] The optical compensation film according to [1], wherein the polymer film is a polymer film containing 1% by mass to 30% by mass of a wavelength dispersion controlling agent having a maximum absorption in a wavelength region of from 250 nm to 400 nm.

[5] The optical compensation film according to [1], wherein the polymer film contains a polymer film of at least one of the compounds represented by the following formula (B-1); In the formula, R ¹ and R ² each represent an alkyl group or an aryl group.

[6] The optical compensation film according to [1], wherein the polymer film contains a deuterated cellulose film mainly composed of deuterated cellulose having a mercapto substitution degree of 2.90 to 3.00.

[7] The optical compensation film according to [1], wherein the polymer film contains a deuterated cellulose film mainly composed of a mixed fatty acid ester having a total thiol substitution degree of 2.70 to 3.00.

[8] The optical compensation film according to [1], which satisfies the following formula (1-6); formula (1-6) 1.06 ≦ Rth (450) / Rth (550) ≦ 1.30.

[9] The optical compensation film according to [1], wherein the optically anisotropic layer satisfies the following formula (1-7): formula (1-7): 1.09 ≦ Rth (450) / Rth (550) ≦ 1.30.

[10] The optical compensation film according to [1], wherein the optically anisotropic layer is a layer formed by curing a polymerizable composition containing a discotic liquid crystal, and among the optically anisotropic layers, the aforementioned discotic liquid crystal It is fixed in a state in which the disk surface is aligned to be horizontal with respect to the layer.

[11] The optical compensation film according to [1], wherein the optically anisotropic layer is formed by immobilizing a polymerizable composition containing a liquid crystal by polymerization in a state of an optically active nematic (cholesteric) liquid crystal phase. Floor.

[12] The optical compensation film of [1], wherein the optically anisotropic layer is a polymer layer formed by coating a polymer material, the polymer layer having a negative refractive index anisotropy and being in a normal direction of the layer Has an optical axis.

[13] The optically exclusive film of [1], wherein the optically anisotropic layer comprises a fluorine-containing surfactant.

[14] A polarizing plate comprising the optical compensation film according to any one of [1] to [13].

[15] An optical compensation film of a C plate having a transparent support C1 and an optically anisotropic layer C2 and satisfying the following formulas (2-1) to (2-4); (2-1) 0≦ Re ₆₃₀ (C1)≦10 (2-2)0≦Re ₅₅₀ (C2)≦10 (2-3)100≦Rth ₅₅₀ (C2)-Rth ₅₅₀ (C1) (2-4)| Rth ₄₅₀ (C2) /Rth ₅₅₀ (C2)-Rth ₄₅₀ (C)/Rth ₅₅₀ (C)|≦0.1 [wherein, Re λ(C1) is the front hysteresis value of the transparent support C1 at the wavelength λ nm (unit: Nai m), Rth λ(C1) is the hysteresis value (unit: nanometer) of the transparent support C1 in the film thickness direction at the wavelength λ nm, and Re λ(C2) is the wavelength λ of the optical anisotropic layer C2 The positive hysteresis value of nanometer (unit: nanometer), Rth λ(C2) is the hysteresis value (unit: nanometer) of the optically isotropic layer C2 at the wavelength λ nanometer, Rth λ (C) is a hysteresis value (unit: nanometer) of the optical compensation film (layered body of C1 and C2) in the film thickness direction at the wavelength λ nm.

[16] The optical compensation film according to [15], wherein the transparent support C1 and the optically anisotropic layer C2 satisfy the following formulas (2-5) to (2-8); (2-5)-25 ≦ Rth ₆₃₀ (C1)≦25 (2-6)100≦Rth ₅₅₀ (C2)≦300 (2-7)-35≦Rth ₄₀₀ (C1)-Rth ₇₀₀ (C1)≦50 (2-8)1.04≦Rth ₄₅₀ (C2)/Rth ₅₅₀ (C2) ≦ 1.30.

[17] The optical compensation film according to [15], wherein the transparent support C1 and/or the optically anisotropic layer C2 are negative C plates.

[18] The optical compensation film according to [15], wherein the transparent support C1 is made of a film of deuterated cellulose. The film of the olefinic polymer, the film of the cycloolefin polymer, and the lactone ring are formed of a film of a polymer resin or a film of a polycarbonate.

[19] The optical compensation film of [15], wherein the optically anisotropic layer C2 is a layer formed by fixing a polymerizable liquid crystal composition containing at least one of a polymerizable liquid crystal compound in a liquid crystal phase.

[20] The optical compensation film of [15], wherein the optically anisotropic layer C2 is a layer formed by fixing a polymerizable liquid crystal composition containing a rod-like liquid crystal compound in a state of a cholesterol phase.

[21] The optical compensation film according to [15], wherein the optically anisotropic layer C2 is a polymerizable liquid crystal composition containing a cholesteric liquid crystal compound, such that the molecules of the discotic liquid crystal compound are aligned in a homeotropic alignment. A layer formed by fixing in a state of a liquid crystal phase.

[22] The optical compensation film according to [19], wherein the optically anisotropic layer C2 further contains a compound having a fluorine-based polymer comprising a repeating unit of the following general formula (a); In the general formula (a), R ¹ , R ² and R ³ each independently represent a hydrogen atom or a substituent; and the Q system has a carboxyl group (-COOH) having at least one phenyl group or a salt thereof, a sulfonic acid group (- SO ₃ H) or a salt thereof, phosphoryloxy {-OP(=O)(OH) ₂ } or a salt thereof, a hydrophilic group (-OH), or a acrylamide (-NR ⁴ - (R ⁴ represents hydrogen) An atom, an alkyl group, an aryl group or an aralkyl group); L represents a group selected from the group of the following linking groups, or a two-valent linking group formed by combining two or more of them; a group of a single bond, -O-, -CO-, -S-, -SO ₂ -, -P(=O)(OR ⁵ )-(R ⁵ represents an alkyl group, an aryl group or an aralkyl group), Alkyl, aryl.

[23] The optical compensation film according to [19], wherein the optically anisotropic layer C2 is a layer formed of the polymerizable liquid crystal composition further containing a polyfunctional monomer having two or more functional groups.

[24] The optical compensation film according to [15], wherein the optically anisotropic layer C2 is a polymer film layer.

[25] An optical compensation film which is an optical compensation film having an optically anisotropic layer on a polymer film substrate, wherein the in-plane retardation (Re) is 0 to 10 nm, and the thickness direction hysteresis (Rth) is 100~300 nm, and the Rth/d (the hysteresis of the thickness direction divided by the film thickness) of the optical anisotropic layer is 0.065 to 0.16.

[26] The optical compensation film of [25], wherein the optically isotropic layer has an Rth/d of from 0.085 to 0.16.

[27] The optical compensation film according to [25], which satisfies the following formula (3-1); formula (3-1) 1.03 ≦ Rth (450) / Rth (550) ≦ 1.30.

[28] The optical compensation film according to [25], wherein the optically anisotropic layer satisfies the following formula (3-2); (3-2) 1.06 ≦ Rth (450) / Rth (550) ≦ 1.30.

[29] The optical compensation film according to [25], wherein the optically anisotropic layer is formed of a polymerizable composition.

[30] The optical compensation film according to [25], wherein the polymerizable composition contains a photopolymerization initiator, and the photoreceptor of the photopolymerization initiator has a range of from 330 nm to 450 nm, and the photopolymerization The initiator is a halogen radical or a hydrocarbon radical having 8 or less atoms other than hydrogen.

[31] The optical compensation film according to [25], wherein the polymerizable composition contains a polyfunctional monomer having four or more double bonds.

[32] The optical compensation film according to [25], wherein the polymerizable composition is a composition comprising a liquid crystalline compound having a polymerizable group, and among the optically anisotropic layers, the dishing liquid crystal property The dish-like structural unit of the compound is horizontally aligned with respect to the surface of the polymer film substrate.

[33] The optical compensation film according to [32], wherein the discotic liquid crystalline compound is a compound represented by the following formula (I). [In the formula, A ¹ and A ² each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms; and Y represents a hydrogen atom; a halogen atom, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a fluorenyl group having 2 to 13 carbon atoms, or an alkylamino group having 1 to 12 carbon atoms, Or a fluorenyl group having 2 to 13 carbon atoms; or a bond between A ² and Y to form a five-membered ring or a six-membered ring; and Z-based as a halogen atom or an alkyl group having 1 to 12 carbon atoms; An alkoxy group having 1 to 12 carbon atoms, a fluorenyl group having 2 to 13 carbon atoms, an alkylamino group having 1 to 12 carbon atoms, or a decyloxy group having 2 to 13 carbon atoms; Is a divalent linkage selected from the group consisting of -O-, -CO-, -S-, -NH-, alkylene, alkenyl, alkynyl, aryl, and the like. Base; Q represents a polymerizable group; a represents an integer from 1 to 4; and b represents an integer from 0 to (4-a).

[34] The optical compensation film according to [29], wherein the polymerizable composition comprises an optically active nematic (cholesteric) liquid crystal compound.

[35] The optical compensation film of [25], wherein the optically anisotropic layer comprises a polymer containing a fluorine-based aliphatic group.

[36] The optical compensation film according to [25], wherein the optically anisotropic layer comprises a polymer material having a negative refractive index anisotropy at the time of coating and having an optical axis in a normal direction of the surface.

[37] The optical compensation film according to [25], wherein the retardation in the thickness direction of the polymer film substrate is -25 to 25 nm.

[38] The optical compensation film of [25], wherein the polymer film is a deuterated cellulose film.

[39] A polarizing plate comprising the optical compensation film according to any one of [1] to [38].

[40] A liquid crystal display device comprising two polarizing films having absorption axes perpendicular to each other, and a pair of substrates and a liquid crystal layer containing liquid crystal molecules sandwiched between the two polarizing plates. And in the non-driving state in which no external electric field is applied, the liquid crystal molecules are aligned to a liquid crystal cell which is slightly perpendicular to the substrate, and any one of [1] to [38] The optical compensation film, or one of the aforementioned polarizing plates, is a polarizing plate as in [39].

[41] The liquid crystal display device of [40], wherein the liquid crystal display device further has a second optical compensation film, wherein the second optical compensation film is composed of a polymer stretched film, and has a front side hysteresis and a retardation in the thickness direction. The following formula (8) and the following formula (9) are satisfied: Formula (8) 70 ≦ Re (550) ≦ 180 Formula (9) 30 ≦ Rth (550) ≦ 140.

[42] The liquid crystal display device of [40], wherein the second optical compensation film satisfies the following formula (10): Formula (10) 0.7 ≦ Re (450) / Re (550) ≦ 1.0.

[43] The liquid crystal display device of [41], wherein the second optical compensation film is made of a bismuth cellulose film, Any type of olefinic film, polycarbonate film, polyester film, and polyfluorene film.

[44] The liquid crystal display device of [41], wherein the second optical compensation film is such that its in-plane retardation axis is vertically laminated on one side of the polarizing film with respect to the absorption axis of the polarizing film.

According to the present invention, it is possible to provide a novel optical compensation film which is useful for optical compensation of a liquid crystal display device of a VA mode, and a polarizing plate, and a liquid crystal display device having a VA mode whose viewing angle characteristics have been improved.

In particular, according to the first aspect of the present invention, it is possible to provide an optical compensation film which is highly productive, has no or less optical characteristics and uneven film thickness, and can optically compensate liquid crystal cells, particularly VA mode liquid crystal cells, correctly. And providing a polarizing plate using the same. Moreover, according to the first aspect of the present invention, it is possible to provide a display device which has no or less display unevenness due to an optical compensation film and which has good optical compensation characteristics, and in particular, can provide a VA mode liquid crystal display device. .

In particular, according to the second aspect of the present invention, it is possible to provide a sufficient Rth on the liquid crystal cell in optical compensation (for example, optical compensation in black display of a liquid crystal cell of the VA mode), and its wavelength dispersion is displayed. An optical compensation film that functions as a C-plate function is produced in a stable and reproducible manner. Further, according to the second aspect of the present invention, it is possible to provide an optical compensation film and a polarizing plate which are useful for optical compensation of a liquid crystal display device, in particular, a liquid crystal display device of a VA mode, and which are excellent in productivity. Moreover, according to the second aspect of the present invention, it is possible to provide a liquid crystal display device, particularly a VA mode liquid crystal display device, in which the change in color gradation of viewing angle characteristics, particularly viewing angle dependence, has been reduced.

In particular, according to the third aspect of the present invention, it is possible to provide an optical compensation film which does not have a film which is uneven and which can accurately compensate the liquid crystal cell accurately. Further, the optical compensation film according to the third aspect of the present invention or the liquid crystal display device including the polarizing plate including the film, in particular, the VA mode liquid crystal display device, is excellent in viewing angle characteristics.

Embodiment of the Invention

Hereinafter, an embodiment of the liquid crystal display device of the present invention and its constituent members will be described in order. In addition, in the present specification, the range of numerical values represented by "~" means that the numerical values described before and after "~" are included as the range of the lower limit and the upper limit.

In the present specification, the terms "parallel" and "vertical" mean a range of less than a strict angle of ±10°. This range is preferably less than ±5° and more preferably less than ±2° with respect to the tight angle. "Substantially parallel," "substantially orthogonal," and "substantially vertical" also mean the same thing. Further, the "late phase axis" means the direction in which the refractive index becomes maximum. Further, the measurement wavelength of the refractive index and the phase difference is a value of λ = 590 nm in the visible light region unless otherwise specified.

In the present specification, the "polarizing plate" includes a long polarizing plate and a size that is cut into a liquid crystal device unless otherwise specified (in the present specification, "cutting" also includes "stamping". The meaning of both (punching) and "cutting" and the like. In the present specification, the "polarizing film" and the "polarizing plate" are used differently. However, the "polarizing plate" refers to a layer of a transparent protective film that protects the polarizing film on at least one side of the "polarizing film". The meaning of the body.

In addition, in the present specification, the description of "(meth) acrylate" means "at least one of acrylate and methacrylate". The same is true for "(meth)acrylic acid".

In the present specification, Re(λ) and Rth(λ) each indicate hysteresis in the plane of the wavelength λ and hysteresis in the thickness direction. The measurement wavelength λ nm may be in the range of the visible light region, and specifically, any wavelength in the range of 400 to 800 nm may be used, but it is preferably in the range of 400 to 750 nm, and more preferably In the range of 400~700 nm. In the present specification, Re and Rth refer to values measured at 530 to 600 nm (or values calculated based on this value) unless otherwise specified. In-plane hysteresis (Re) is such that, in KOBRA 21ADH or WR (Oji Scientific Instruments Co., Ltd.), light having a wavelength of λ nm is incident on a value measured in the normal direction of the film. In the case where the film to be measured represents a one-axis or two-axis refractive index round body, Rth is calculated in accordance with the following method.

Rth is a thin film method in which an in-plane retardation axis (determined according to KOBRA 21ADH or WR) is used as a tilt axis (rotation axis) (in the case where there is no slow phase axis, any direction in the film plane is used as a rotation axis) In the line direction, from the normal direction to 50 degrees on one side, the Re which is incident on the light having a wavelength of λ nm from the oblique direction is measured at a step of every 10 degrees, and all of the above-mentioned Re are measured at 6 points, based on the measurement. The hysteresis value, the assumed value of the average refractive index, and the input film thickness value are calculated by KOBRA 21ADH or WR.

In the above, in the case of a film having a direction in which the in-plane hysteresis axis is a rotation axis and a hysteresis at a certain inclination angle is zero, a hysteresis of an angle larger than the inclination angle is used. After the symbol is changed to negative, it is calculated by KOBRA 21ADH or WR.

In addition, the slow phase axis can be used as the tilt axis (rotation axis) (if there is no slow phase axis, any direction in the film plane is used as the rotation axis), and the hysteresis value can be measured from any two oblique directions, based on the value and the average refractive index. Assuming the value and the input film thickness value (d), Rth is calculated according to the following formulas (1) and (2).

Equation (2) Rth=((nx+ny)/2-nz)×d

Re( θ ) in the above formula represents a hysteresis value in a direction in which the angle θ is inclined from the normal direction.

In the above formula, nx represents the refractive index in the in-plane slow axis direction, ny represents the refractive index perpendicular to the nx direction in the plane, and nz represents the refractive index perpendicular to the nx and ny directions. d is the film thickness.

When the film to be measured cannot be expressed by an elliptical body having a refractive index of 1 or 2 axes, that is, a film having no optical axis (opticaxis), Rth is calculated in accordance with the following method. Rth is an in-plane retardation axis (determined according to KOBRA 21ADH or WR) as the tilt axis (rotation axis), from -50 degrees to +50 degrees with respect to the normal direction of the film, at intervals of every 10 degrees. The Re of the light incident on the wavelength λ nm from the oblique direction was measured, and all 11 points were measured, and based on the measured hysteresis value, the assumed value of the average refractive index, and the input film thickness value, by KOBRA 21ADH or WR Calculated. From this calculated nx, ny, and nz, Nz = (nx - nz) / (nx - ny) is further calculated. Further, in the present specification, the measurement wavelength is a measurement value of 590 nm, 25 ° C, and 60% RH unless otherwise specified.

. First aspect

[Optical Compensation Film of the First Aspect] The optical compensation film of the first aspect of the invention is an optical compensation film having at least one optical anisotropic layer on the polymer film. The optical compensation film according to the first aspect of the present invention has substantially no in-plane hysteresis, has a negative refractive index anisotropy, and has an optical axis in the normal direction. The in-plane retardation Re of the optical compensation film according to the first aspect of the present invention is 0 to 10 nm, more preferably 0 to 5 nm, and particularly preferably 0 to 3 nm. The Rth in the thickness direction is 100 to 300 nm, more preferably 120 to 270 nm, and particularly preferably 150 to 240 nm. In the case of the optical compensation film for a liquid crystal display device of the VA mode, the wavelength dispersion Rth(450)/Rth(550) of the optical compensation film is preferably 1.06 or more, more preferably 1.09 or more, and still more preferably 1.12 or more. It is more ideal than 1.15. Here, Rth (450) represents a Re value for light having a wavelength of 450 nm; and Re (550) represents a Re value for light having a wavelength of 550 nm. When the conditions of the above-described wavelength dispersion characteristics are satisfied, the VA mode liquid crystal display device can be compensated for in the entire range of visible light.

Hereinafter, the polymer film and the optical anisotropic layer of the elements of the optical compensation film according to the first aspect of the present invention will be described in detail.

[Polymer film] The polymer film of the optical compensation film according to the first aspect of the present invention satisfies the following formulas (1-1) to (1-3).

-50 nm≦Rth(590)≦150 nm.........(1-1) -5 nm≦Rth(450)-Rth(550).........(1-2) 0≦Re(590)≦10 Nm.........Formula (1-3)

In the formula (1-1), Rth(590) is preferably -20 nm or more, more preferably 0 nm or more, still more preferably 20 nm or more, and particularly preferably 40 nm or more. Further, Rth (590) is preferably 120 nm or less, more preferably 100 nm or less, and particularly preferably 90 nm or less.

In the formula (1-2), [Rth(450)-Rth(550)] is preferably -5 nm or more, more preferably 0 nm or more, particularly preferably 5 nm or more; although the upper limit is not It is specifically limited, however, it is preferably 100 nm or less, more preferably 50 nm or less, and still more preferably 30 nm or less.

In the formula (1-3), Re(590) is preferably 0 to 5 nm.

Further, when Rth (590) is 20 nm or more, it is preferred to satisfy the following formula (1-5).

1.0<Rth(450)/Rth(550)<4.0 Equation (1-5)

Rth (450) / Rth (550) is preferably 1.03 or more, more preferably 1.06 or more, and particularly preferably 1.09 or more. Further, Rth (450) / Rth (550) is preferably 3.0 or less, more preferably 2.0 or less, and particularly preferably 1.5 or less.

The material of the polymer film described above is not particularly limited, and a polymer film formed of various materials satisfying the above optical characteristics can be used. Among them, from the viewpoint of inexpensive raw materials and suitability of polarizing plates, it is preferred to use a cellulose-based film. In addition, in the present specification, the "deuterated cellulose-based film" means a cellulose which is a main component contained in a polymer composition constituting a film, and specifically, is contained in relation to the total weight of the film. It is 70% by mass or more, and more preferably 80% by mass or more of deuterated cellulose. In the present specification, the terms "mainly included" and "principal component" as used hereinafter mean the same meaning.

Deuterated cellulose refers to a substance in which a part or all of the hydroxyl group in the cellulose is substituted with a mercapto group. The degree of substitution of deuterated cellulose means the ratio of the three hydroxyl groups present in the constituent unit of cellulose (glucose in (β) 1,4-glycidyl linkage). The degree of substitution (degree of deuteration) can be calculated by measuring the amount of bound fatty acid per unit mass of cellulose. The measurement method was carried out based on "ASTM D 817-91".

Other preferred deuterated celluloses used in the raw material of the polymer film are mixed fatty acid esters having a total thiol substitution degree of 2.70 to 3.00. More preferably, it is a mixed fatty acid ester having a mercapto group having a total thiol substitution degree of 2.80 to 3.00 and a carbon number of 3 to 4. The degree of thiol substitution of the above mixed fatty acid ester is more preferably from 2.85 to 2.97. Further, the substitution degree of the thiol group having a carbon number of 3 to 4 is preferably 0.1 to 2.0, more preferably 0.3 to 1.5.

The deuterated cellulose used in the first aspect of the present invention preferably has a mass average degree of polymerization of from 350 to 800, more preferably from 370 to 600. Further, the deuterated cellulose used in the first aspect of the present invention preferably has an average molecular weight of 70,000 to 230,000, more preferably has an average molecular weight of 75,000 to 230,000, and preferably has 78,000 to 120,000. Number average molecular weight.

The deuterated cellulose used in the first aspect of the present invention can be synthesized using an acid anhydride and an acid chloride as a deuteration agent. In the case where the above-mentioned deuteration agent is an acid anhydride, an organic acid (for example, acetic acid) and dichloromethane are used as a reaction solvent. Further, a protic catalyst such as sulfuric acid can be used as a catalyst. In the case where the oximation agent is an acid chloride, a basic compound can be used as a catalyst. The most common synthetic method in the industry, which consists of an organic acid (acetic acid, propionic acid, butyric acid) or an anhydride (acetic anhydride, propionic anhydride, butyric anhydride) containing an ethyl sulfonium group and a corresponding sulfhydryl group. The organic acid component is mixed, and cellulose is esterified to synthesize cellulose.

Among the methods, such as linter and wood pulp, most of the cases are activated by an organic acid such as acetic acid, and then used in the presence of a sulfuric acid catalyst. The mixture of organic acid components as described above is esterified. The organic acid component is generally used in excess relative to the amount of hydroxyl groups present in the cellulose. In this esterification treatment, in addition to the esterification reaction, a hydrolysis reaction (depolymerization reaction) of the cellulose main chain ((β) 1,4-glycidyl bond) is carried out. When the main chain hydrolysis reaction is carried out, the degree of polymerization of the cellulose ester is lowered, and the physical properties of the produced cellulose ester film are lowered. Therefore, the reaction conditions such as the reaction temperature are preferably determined in consideration of the degree of polymerization and molecular weight of the obtained cellulose ester.

In order to obtain a cellulose ester having a high degree of polymerization (large molecular weight), it is important to adjust the maximum temperature in the esterification reaction step to 50 ° C or lower. The maximum temperature is preferably adjusted to 35~50 °C, and more preferably adjusted to 37~47 °C. When the reaction temperature is 35 ° C or more, the esterification reaction is preferably carried out smoothly. In addition, when the reaction temperature is 50 ° C or lower, it is preferable because the polymerization degree of the cellulose ester is not lowered.

When the reaction is stopped while suppressing the temperature rise after the esterification reaction, the decrease in the degree of polymerization can be further suppressed, and the cellulose ester having a high degree of polymerization can be synthesized. That is, when a reaction stopper (for example, water, acetic acid) is added after the end of the reaction, an excess of an acid anhydride which is not related to the esterification reaction may be accompanied by hydrolysis to produce an organic acid. Such a hydrolysis reaction causes the temperature inside the reaction device to rise with intense heat generation. When the rate of addition of the reaction stopping agent is not excessively large, the problem that the cooling ability of the reaction apparatus is not excessively increased and the heat generation of the cellulose main chain is remarkably progressed, and the degree of polymerization of the obtained cellulose ester is lowered does not occur. . Further, in the esterification reaction, a part of the catalyst is bonded to cellulose, and most of them are dissociated from the cellulose in the addition of the reaction stopper. At this time, if the rate of addition of the reaction stopper is not excessively large, the sufficient reaction time required for dissociation of the catalyst can be ensured, and thus it is difficult to cause a problem that a part of the catalyst is bonded to the cellulose and remains. A cellulose ester partially bonded with a strong acid catalyst has a very poor stability and is easily decomposed by heat during drying of the product to cause a decrease in polymerization degree. For these reasons, after the esterification reaction, it is preferred to add the reaction stopper for 4 minutes or more, more preferably 4 to 30 minutes, and it is desirable to stop the reaction. In addition, when the addition time of the reaction stopper is 30 minutes or less, it is preferable because there is no problem such as a decrease in industrial productivity.

As the reaction stopping agent, water and alcohol which decompose the anhydride can be generally used. However, in order not to precipitate a triester having low solubility in various organic solvents, it is preferred to use a mixture of water and an organic acid as a reaction stopper. When the esterification reaction is carried out under the conditions as above, a high molecular weight cellulose ester having a mass average degree of polymerization of 500 or more can be easily synthesized.

In the case where a deuterated cellulose-based film is used as the above-mentioned polymer film, the film preferably contains a wavelength dispersion controlling agent. Here, the "wavelength dispersion controlling agent" is a compound which adjusts the wavelength dispersion of the hysteresis of the film. The wavelength dispersion controlling agent used in the first aspect of the present invention is preferably a compound having a maximum absorption in a wavelength range of from 250 nm to 400 nm, more preferably in a wavelength range of from 270 nm to 380 nm. A compound that absorbs greatly. The maximum absorption system of the wavelength dispersion controlling agent is dissolved in a concentration of 0.01 g/liter to 0.1 g/liter in dichloromethane, methanol or tetrahydrofuran, and a spectrophotometer UV-3500 manufactured by Shimadzu Corporation is used. The value displayed when measuring the absorption spectrum.

The above-mentioned wavelength dispersion controlling agent is preferably a compound represented by the general formula (III) to (VI); and more preferably, it is a compound represented by the general formula (III).

In the formula, Q ¹ and Q ² each represent an aromatic ring. The X system represents O (oxygen atom), S (sulfur atom) or NR (N: nitrogen atom, R: hydrogen atom or substituent); and Y represents a substituent. Y is preferably a hydrogen atom. XY can also be a hydrogen atom.

The aromatic ring represented by Q ¹ and Q ² may be an aromatic hydrocarbon ring or an aromatic hetero ring. Further, these may be a single ring or may further form a condensed ring with other rings.

The aromatic hydrocarbon ring represented by Q ¹ and Q ² is preferably a monocyclic or bicyclic aromatic hydrocarbon ring having 6 to 30 carbon atoms (for example, a benzene ring, a naphthalene ring, etc.) More preferably, it is an aromatic hydrocarbon ring having 6 to 20 carbon atoms, and more preferably an aromatic hydrocarbon ring having 6 to 12 carbon atoms. Among these, it is preferably a single ring, and particularly preferably a benzene ring.

The aromatic heterocyclic ring represented by Q ¹ and Q ² is preferably an aromatic heterocyclic ring containing at least one of an oxygen atom, a nitrogen atom or a sulfur atom. Specific examples of the heterocyclic ring, for example, furan, pyrrole, thiophene, imidazole, pyrazole, pyridine, pyridyl ,despair Triazole, trinitrogen , hydrazine, carbazole, hydrazine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, hydrazine , naphthyridine, quinoxaline, quinazoline, Porphyrin, acridine, acridine, morphine, brown Each of the rings of tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole, tetraterpene, and the like. As the aromatic heterocyclic ring, it is preferably pyridine or trinitrogen. , quinoline and the like.

The aromatic ring represented by Q ¹ and Q ² is preferably an aromatic hydrocarbon ring, more preferably an aromatic hydrocarbon ring having 6 to 12 carbon atoms, more preferably substituted or unsubstituted. Benzene ring.

The Q ¹ and Q ² groups may have a substituent, and are preferably a substituent T to be described later. When possible, the substituents may be bonded to each other to form a ring structure. However, the substituent does not contain a carboxylic acid or a sulfonic acid or a quaternary ammonium salt. The solubility of these hydrophilic groups is low and causes the water permeability to deteriorate.

X represents NR (R represents a hydrogen atom or a substituent, and the substituent may be a substituent T to be described later), an oxygen atom or a sulfur atom; and X is preferably NR (R is preferably a fluorenyl group or a sulfonyl group, and These substituents may be further substituted) or an oxygen atom, particularly preferably an oxygen atom.

As the substituent T, for example, it may be an alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms), for example, for example, Methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n-fluorenyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.; Preferably, the number of carbon atoms is 2 to 20, more preferably 2 to 12, and particularly preferably 2 to 8, for example, vinyl, allyl, 2-butenyl, 3-pentenyl, etc.) Alkynyl (preferably having 2 to 20 carbon atoms, more preferably 2 to 12, particularly preferably 2 to 8, for example, propargyl, 3-pentynyl, etc.); aryl ( Preferably, the number of carbon atoms is from 6 to 30, more preferably from 6 to 20, particularly preferably from 6 to 12, for example, phenyl, p-methylphenyl, naphthyl, etc.; substituted or unsubstituted The amine group (preferably having a carbon number of 0 to 20, more preferably 0 to 10, particularly preferably 0 to 6, for example, an amine group, a methylamino group, a dimethylamino group, or a second group) Ethylamino group, benzhydrylamino group, etc.; alkoxy group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12, particularly preferably 1 to 8, for example, A oxygen , ethoxy, butoxy, etc.; aryloxy (preferably having 6 to 20 carbon atoms, more preferably 6 to 16, more preferably 6 to 12, for example, phenoxy group, 2-naphthyloxy group or the like; fluorenyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, for example, ethyl fluorenyl group and benzamidine group) , a mercapto group, a trimethylethenyl group, etc.; an alkoxycarbonyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16, more preferably 2 to 12, for example, for example, a methoxycarbonyl group, an ethoxycarbonyl group, etc.; an aryloxycarbonyl group (preferably having a carbon number of 7 to 20, more preferably 7 to 16, particularly preferably 7 to 10, for example, a phenoxy group) a carbonyl group, etc.; a decyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms), for example, an ethoxylated group or a benzamidineoxy group. And the like; amidino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, and particularly preferably 2 to 10 carbon atoms), for example, an acetamino group, a benzylamino group, etc. Alkoxycarbonylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16, particularly preferably 2 to 12, for example, methoxycarbonylamino group, etc.); a carbonylamino group (preferably having a carbon number of 7 to 20, more preferably 7 to 16, particularly preferably 7 to 12, for example, a phenoxycarbonylamino group, etc.); a sulfonylamino group (preferably, the number of carbon atoms is from 1 to 20, more preferably from 1 to 16, particularly preferably from 1 to 12, for example, for example, a methylsulfonylamino group, a benzenesulfonylamino group, etc.); Mercapto group (preferably having a carbon number of 0 to 20, more preferably 0 to 16, particularly preferably 0 to 12, for example, amidoxime, methylamine sulfonyl, dimethylamine a sulfonyl group, a phenylamine sulfonyl group, etc.; an amine carbenyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16, more preferably 1 to 12, for example, an amine) a mercapto group, a methylamine methyl sulfonyl group, a diethylamine methyl sulfonyl group, a phenylamine methyl fluorenyl group, etc.; an alkylthio group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms). Particularly preferred is 1 to 12, for example, methylthio, ethylthio, etc.; arylthio (preferably having 6 to 20 carbon atoms, more preferably 6 to 16, more preferably 6 to 6) 12, for example, phenylthio group, etc.; sulfonyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16, more preferably 1 to 12, for example, A Sulfonyl Tolsulfonyl group, etc.; sulfinyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16, more preferably 1 to 12, for example, sulfinyl group, benzene) Sulfhydryl group, etc.; ureido group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16, more preferably 1 to 12, for example, ureido, methylureido, benzene) A ureido group (preferably, the guanamine group is preferably 1 to 20, more preferably 1 to 16, and particularly preferably 1 to 12, for example, diethylphosphonium amide, Phenylphosphonium phosphate, etc.; hydroxy, thiol, halogen atom (for example, fluorine atom, chlorine atom, bromine atom, iodine atom); cyano group, nitro group, hydroxamic acid group, sulfinic acid group, hydrazine a group, an imido group; a heterocyclic group (preferably having 1 to 30 carbon atoms, more preferably 1 to 12, a hetero atom, for example, a nitrogen atom, an oxygen atom, a sulfur atom, specifically, For example, it may be imidazolyl, pyridyl, quinolyl, furyl, piperidinyl, morpholinyl, benzoxazolyl, benzimidazolyl, benzothiazolyl, etc.; decylalkyl (preferably The number of carbon atoms is 3 to 40, more preferably 3 to 30, and particularly preferably 3 to 24, for example For example, trimethyldecylalkyl, triphenyldecylalkyl, etc.) and the like. These substituents may be further substituted by the above-mentioned substituent T. Further, when the number of substituents is two or more, they may be the same or different. Further, if possible, they may be connected to each other to form a ring.

As the general formula (III), a compound represented by the following general formula (III-A) is preferred.

General formula (III-A)

In the formula, R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ each independently represent a hydrogen atom or a substituent.

R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ each independently represent a hydrogen atom or a substituent, and as a substituent, the aforementioned substituent may be applied. T. Further, these substituents may be further substituted by other substituents, or the substituents may be condensed to each other to form a ring.

As R ¹ , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁸ and R ⁹ , a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group is preferred. , alkoxy group, aryloxy group, hydroxyl group, halogen atom; more preferably hydrogen atom, alkyl group, aryl group, alkoxy group, aryloxy group, halogen atom; more preferably hydrogen atom, carbon number 1~12 The alkyl group; particularly preferably a hydrogen atom or a methyl group; most preferably a hydrogen atom.

As R ² , it is preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group or a halogen atom; more preferably hydrogen. An atom, an alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, and a carbon number of 6 to 12 An aryloxy group or a hydroxyl group; more preferably an alkoxy group having 1 to 20 carbon atoms; particularly preferably an alkoxy group having 1 to 12 carbon atoms.

As R ⁷ are, the more desirable is a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or non-substituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group, a halogen atom; is more suitably hydrogen An atom, an alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, and a carbon number of 6 to 12 An aryloxy group or a hydroxyl group; more preferably a hydrogen atom or an alkyl group having 1 to 20 carbon atoms (preferably having 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, more preferably a methyl group). ); particularly preferred are methyl and hydrogen atoms.

As the general formula (III), a compound represented by the following general formula (III-B) is more preferred.

In the formula, R ¹⁰ represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group.

R ¹⁰ represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group; The aforementioned substituent T is applied.

As R ¹⁰ , it is preferably a substituted or unsubstituted alkyl group, more preferably a substituted or unsubstituted alkyl group having 5 to 20 carbon atoms, more preferably a substitution of 5 to 12 carbon atoms. Or an unsubstituted alkyl group (for example, n-hexyl, 2-ethylhexyl, n-octyl, n-fluorenyl, n-dodecyl, benzyl, etc.), particularly preferably A substituted or unsubstituted alkyl group having 6 to 12 carbon atoms (for example, 2-ethylhexyl, n-octyl, n-fluorenyl, n-dodecyl, benzyl, etc.) ).

The compound represented by the general formula (III) can be synthesized by a known method described in JP-A-11-12219.

Specific examples of the compound represented by the general formula (III-A) are listed below. However, the compound used in the first aspect of the present invention is not limited to any specific examples described below.

In the first aspect of the present invention, from the viewpoint of volatility, a compound having a molecular weight of from 250 to 1,000 in the compound represented by the above general formula (III) can be used; more preferably, the molecular weight is 260~ 800, more preferably, the molecular weight is 270-700, and the molecular weight is 300-600.

General formula (IV)

In the formula (IV), R ¹ , R ² , R ³ , R ⁴ and R ⁵ are each a monovalent organic group, and at least one of R ¹ , R ² and R ³ is a total carbon number of 10~ An unsubstituted branched or linear alkyl group of 20.

In the formula (V), R ¹ , R ² , R ³ , R ⁴ and R ⁵ are each a monovalent organic group, and R ⁶ is a branched alkyl group.

Further, it is preferably a compound represented by the following general formula (VI) described in JP-A-2003-315549, and it can be used.

In the formula (VI), R ⁰ and R ¹ each represent a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, a phenylalkyl group having 7 to 9 carbon atoms, an unsubstituted or 1 carbon atom. An alkyl substituted phenyl group of ~4, a substituted or unsubstituted oxycarbonyl group, or a substituted or unsubstituted aminocarbonyl group. R ² to R ⁵ and R ¹⁹ to R ²³ each independently represent a hydrogen atom or a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms.

As a preferable example of the wavelength dispersion controlling agent, for example, an oxybenzophenone compound, a benzotriazole compound, a salicylate compound, a cyanoacrylate compound, and nickel are exemplified. A wrong salt compound or the like.

The benzotriazole-based wavelength dispersion controlling agent may be, for example, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole or 2-(2'-hydroxy-3'. , 5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)benzotriazole, 2-( 2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-(3",4",5", 6"-tetradecylimine methyl)-5'-methylphenyl)benzotriazole, 2,2-methylenebis(4-(1,1,3,3-tetramethylbutyl) - 6-(2H-benzotriazol-2-yl)phenolyl), 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzo Triazole, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfonate diphenyl Ketone, bis(2-methoxy-4-hydroxy-5-benzhydrylphenylmethane), (2,4-bis-(n-octylthio)-6-(4-hydroxy-3,5 -di-tert-butylanilino)-1,3,5-three , 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert -pentylphenyl)-5-chlorobenzotriazole, 2,6-di-tert-butyl-p-cresol, pentaerythritol-indole [3-(3,5-di-tert-butyl-4) -hydroxyphenyl)propionate], triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol - bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,4-bis-(n-octylsulfanyl)-6-(4-hydroxy-3) ,5-di-tert-butylanilino)-1,3,5-three , 2,2-thio-di-extended ethyl bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5- Di-tert-butyl-4-hydroxyphenyl)propionate, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxy-hydrocinnamylamine), 1 ,3,5-trimethyl-2,4,6-paran (3,5-di-tert-butyl-4-hydroxybenzyl)benzene, gins-(3,5-di-tert-butyl 4-hydroxybenzyl)-isocyanate or the like. In particular, it is preferably (2,4-bis-(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylanilino)-1,3,5-three , 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, (2(2'-hydroxy-3',5'-di-tert -butylphenyl)-5-chlorobenzotriazole, 2,6-di-tert-butyl-p-cresol, pentaerythritol-indole [3-(3,5-di-tert-butyl-4) -hydroxyphenyl)propionate], triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate]. Further, for example, it may be used in combination. N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propyl]indole and the like metal inert agent and ginseng (2,4-di-tert-butyl) Phosphate-based stabilizers such as phenyl)phosphines, etc. The amount of these compounds added is preferably from 1 ppm to 1.0%, more preferably from 10 to 1000 ppm, based on the mass ratio of the cellulose.

Further, as the above-mentioned wavelength dispersion controlling agent, a compound represented by the following general formula (VII) can also be used.

General formula (VII) Q ¹ -Q ² -OH

Where Q ¹ represents ¹ , 3, 5 - 3 Ring, Q ² represents an aromatic ring.

Among the compounds represented by the above general formula (VII), a compound represented by the following general formula (VII-A) is preferred.

General formula (VII-A)

In the above general formula (VII-A), R ¹ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, an alkenyl group having 3 to 18 carbon atoms, Phenyl; phenyl, OH, alkoxy group having 1 to 18 carbon atoms, cycloalkoxy group having 5 to 12 carbon atoms, alkenyloxy group having 3 to 18 carbon atoms, halogen atom, - COOH, -COOR ⁴ , -O-CO-R ⁵ , -O-CO-O-R ⁶ , -CO-NH ₂ , -CO-NHR ⁷ , -CO-N(R ⁷ )(R ⁸ ), CN , NH ₂ , NHR ⁷ , -N(R ⁷ )(R ⁸ ), -NH-CO-R ⁵ , phenoxy, phenoxy substituted with an alkyl group having 1 to 18 carbon atoms, phenyl group An alkoxy group having 1 to 4 carbon atoms, a bicycloalkoxy group having 6 to 15 carbon atoms, a bicycloalkylalkoxy group having 6 to 15 carbon atoms, and a bicycloolefin having 6 to 15 carbon atoms Alkoxy group or an alkyl group having 1 to 18 carbon atoms which is substituted by a tricycloalkoxy group having 6 to 15 carbon atoms; OH, an alkyl group having 1 to 4 carbon atoms, and a carbon number; 2 to 6 alkenyl or a cycloalkyl group having 5 to 12 carbon atoms substituted with -O-CO-R ⁵ ; glycidyl group; -CO-R ⁹ or -SO ₂ -R ¹⁰ ; or R ¹ system Representative The number of carbon atoms interrupted by an oxygen atom (ie, linked by an ether bond (-O-)) and/or substituted by an OH, a phenoxy group or an alkylphenoxy group having 7 to 18 carbon atoms Is an alkyl group of 3 to 50; or R ¹ represents -A; -CH ₂ -CH(XA)-CH ₂ -O-R ¹² ;-CR ¹³ R' ¹³ -(CH ₂ ) _m -X-A ;-CH ₂ -CH(OA)-R ¹⁴ ;-CH ₂ -CH(OH)-CH ₂ -XA; -CR ¹⁵ R' ¹⁵ -C(=CH ₂ )-R" ¹⁵ , -CR ¹³ R' ¹³ -(CH ₂ ) _m -CO-X-A, -CR ¹³ R' ¹³ -(CH ₂ ) _m - CO-O-CR ¹⁵ R' ¹⁵ -C(=CH ₂ )-R" ¹⁵ or -CO-O-CR ¹⁵ R' ¹⁵ -C(=CH ₂ )-R" ¹⁵ (wherein A represents - One of the definitions of CO-CR ¹⁶ =CH-R ¹⁷ ); the base R ² represents an alkyl group having 6 to 18 carbon atoms independently, an alkenyl group having 2 to 6 carbon atoms, a phenyl group, and carbon. A phenylalkyl group having 7 to 11 atoms, COOR ⁴ , CN, -NH-CO-R ⁵ , a halogen atom, a trifluoromethyl group, -O-R ³ , and R ³ represents a definition given for R ¹ . R ⁴ represents an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 3 to 18 carbon atoms, a phenyl group, a phenylalkyl group having 7 to 11 carbon atoms, and a carbon number of 5 to 12 a cycloalkyl group; or R ⁴ represents a group which may be interrupted by 1 or more -O-, -NH-, -NR ⁷ -, -S- (ie, linked by any of the above) and An alkyl group having 3 to 50 carbon atoms substituted with an OH group, a phenoxy group or an alkylphenoxy group having 7 to 18 carbon atoms; and R ⁵ represents an alkyl group having 1 to 18 carbon atoms and a carbon atom. Number 2 to 18 a cycloalkyl group having 5 to 12 carbon atoms, a phenyl group, a phenylalkyl group having 7 to 11 carbon atoms, a bicycloalkyl group having 6 to 15 carbon atoms, and a double ring having 6 to 15 carbon atoms. Alkenyl group, a tricycloalkyl group having 6 to 15 carbon atoms; R ⁶ represents H, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 3 to 18 carbon atoms, a phenyl group, and a carbon atom a phenylalkyl group of 7 to 11 and a cycloalkyl group having 5 to 12 carbon atoms; and R ⁷ and R ⁸ each independently represent an alkyl group having 1 to 12 carbon atoms and a carbon number of 3 to 12 An alkoxyalkyl group, a dialkylaminoalkyl group having 4 to 16 carbon atoms, or a cycloalkyl group having 5 to 12 carbon atoms; or R ⁷ and R ⁸ together representing a carbon number of 3~ a alkylene group of 9 or an oxaalkylene group having 3 to 9 carbon atoms or an azaalkylene group having 3 to 9 carbon atoms; and the R ⁹ group representing an alkyl group having 1 to 18 carbon atoms and carbon An alkenyl group having 2 to 18 atoms, a phenyl group, a cycloalkyl group having 5 to 12 carbon atoms, a phenylalkyl group having 7 to 11 carbon atoms, a bicycloalkyl group having 6 to 15 carbon atoms, a bicycloalkylalkyl group having 6 to 15 carbon atoms, a bicycloalkenyl group having 6 to 15 carbon atoms, a tricycloalkyl group having 6 to 15 carbon atoms, and a R ¹⁰ system The alkyl group having 1 to 12 carbon atoms, a phenyl group, a naphthyl group or an alkylphenyl group having 7 to 14 carbon atoms; the group R ¹¹ represents an independent H and a carbon number of 1 to 18; An alkyl group, an alkenyl group having 3 to 6 carbon atoms, a phenyl group, a phenylalkyl group having 7 to 11 carbon atoms, a halogen atom, an alkoxy group having 1 to 18 carbon atoms, and R ¹² representing carbon An alkyl group having 1 to 18 atoms, an alkenyl group having 3 to 18 carbon atoms, a phenyl group, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or a carbon atom a phenyl group having 3 to 8 alkenyloxy groups, a halogen atom or a trifluoromethyl group substituted 1 to 3 times; or a phenylalkyl group having 7 to 11 carbon atoms and a cycloalkane having 5 to 12 carbon atoms a tricycloalkyl group having 6 to 15 carbon atoms, a bicycloalkyl group having 6 to 15 carbon atoms, a bicycloalkylalkyl group having 6 to 15 carbon atoms, and a double ring having 6 to 15 carbon atoms. Alkenylalkyl, -CO-R ⁵ ; or R ¹² represents that it may be interrupted by more than 1 -O-, -NH-, -NR ⁷ -, -S- (ie, by any of the And the alkyl group substituted with OH, phenoxy or an alkylphenoxy group having 7 to 18 carbon atoms and having 3 to 50 carbon atoms ; R ¹³ and R ^'13 independently of one another represent lines H, an alkyl group having a carbon number of 1 to 18, a phenyl group; R ¹⁴ carbon atoms based on behalf of the alkyl group having 1 to 18 carbon atoms, 3 to 12 Alkoxyalkyl, phenyl, phenyl-alkyl having 1 to 4 carbon atoms; R ¹⁵ , R' ¹⁵ and R" ¹⁵ are each independently representing H or CH ₃ ; R ¹⁶ represents H, -CH ₂ -COO-R ⁴ , an alkyl group having 1 to 4 carbon atoms, or CN; R ¹⁷ represents H, -COOR ⁴ , an alkyl group having 1 to 17 carbon atoms, or a phenyl group; Representing -NH-, -NR ⁷ -, -O-, -NH-(CH ₂ ) _p -NH-, or -O-(CH ₂ ) _q -NH-; and the index m representing an integer from 0 to 19; The n series represents an integer from 1 to 8; the p system represents an integer from 0 to 4; and the q system represents 2, 3, or 4.

However, in the general formula (VII-A), at least one of R ¹ , R ² and R ¹¹ is a group containing two or more carbon atoms.

R ¹ to R ¹⁰ , R ¹² to R ¹⁴ , R ¹⁶ and R ¹⁷ which are each an alkyl group are preferably a linear or branched alkyl group, and specific examples thereof include a methyl group, an ethyl group, and a propyl group. , isopropyl, n-butyl, t-butyl, isobutyl, tert-butyl, 2-ethylbutyl, n-pentyl, isopentyl, 1-methylpentyl, 1,3 - dimethylbutyl, n-hexyl, 1-methylhexyl, n-heptyl, isoheptyl, 1,1,3,3-tetramethylbutyl, 1-methylheptyl, 3-methyl Heptyl, n-octyl, 2-ethylhexyl, 1,1,3-trimethylhexyl, 1,1,3,3-tetramethylheptyl, decyl, decyl, undecyl , 1-methylundecyl, dodecyl, 1,1,3,3,5,5-hexamethylhexyl, tridecyl, tetradecyl, pentadecyl, hexadecane Base, heptadecyl and octadecyl.

As a cycloalkyl group having a carbon number of 5 to 12. R ^1, R ³ ~ R ⁹ and R ¹² are, for example, which lines cyclopentyl, cyclohexyl, cyclopropyl, cyclooctyl, nonyl, ring Mercapto, cycloundecyl, cyclododecyl; preferably cyclopentyl, cyclohexyl, cyclooctyl and cyclododecyl.

Among R ⁶ , R ⁹ , R ¹¹ and R ¹² as alkenyl groups, preferred examples include allyl, isopropenyl, 2-butenyl, 3-butenyl, isobutenyl, n -penta-2,4-dienyl, 3-methyl-but-2-enyl, n-oct-2-enyl, n-dodec-2-ene, iso-dodecenyl, n-ten Di-2-alkenyl and n-octa-4-enyl.

The number of substituents of the substituted alkyl, cycloalkyl or phenyl group is preferably 1 or more; the substituent may be held in the bonded carbon atom (in the α position) or other carbon atoms; When the substituent is bonded by a hetero atom (for example, an alkoxy group), the bonding position of the substituent is preferably a part other than the α position, and the number of carbon atoms of the substituted alkyl group is preferably 2 or more. More preferably it is 3 or more. More than 2 substituents are preferably bonded to different carbon atoms.

The alkyl group interrupted by -O-, -NH-, -NR ⁷ -, -S- may be interrupted by the above-mentioned groups, and in each case, generally in one bond Inserting one group and not producing a hetero-hetero bond, for example, O-O, S-S, NH-NH, etc.; in the case where the interrupted alkyl group is further substituted, relative to the hetero atom The substituent is usually not at the alpha position. In the case where two or more -O-, -NH-, -NR ⁷ -, -S-interrupted groups are generated in one group, they are generally the same.

The aryl group is usually an aromatic hydrocarbon group such as a phenyl group, a biphenyl group or a naphthyl group, and is preferably a phenyl group and a biphenyl group. The aralkyl group is usually an aryl group, particularly an alkyl group substituted with a phenyl group; thus, an aralkyl group having 7 to 20 carbon atoms includes, for example, a benzyl group, an α-methylbenzyl group, or a phenyl group. Base, phenylpropyl, phenylbutyl, phenylpentyl and phenylheptyl; phenylalkyl having 7 to 11 carbon atoms is preferably phenyl, α-methylbenzyl and α,α - dimethylbenzyl.

The alkylphenyl group and the alkylphenoxy group are each a phenyl group and a phenoxy group substituted with an alkyl group.

The halogen atom of the halogen substituent is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, preferably a fluorine atom or a chlorine atom, and particularly preferably a chlorine atom.

An alkyl group having 1 to 20 carbon atoms, for example, a methylene group, an ethyl group, a propyl group, a butyl group, a pentyl group or a hexyl group. The alkyl chain herein may be straight or branched, for example, isopropyl.

a cycloalkenyl group having 4 to 12 carbon atoms, for example, 2-cyclobuten-2-yl, 2-cyclopenten-1-yl, 2,4-cyclopentadien-1-yl, 2 - cyclohexen-1-yl, 2-cycloheptyl-1-yl, or 2-cyclooctene-1-yl.

a bicycloalkyl group having 6 to 15 carbon atoms, for example, a system thereof Base Base, [2.2.2] bicyclooctyl. More suitable Base and drop Base, especially good Base and drop -2-yl.

a bicycloalkoxy group having 6 to 15 carbon atoms, for example, a system thereof Oxyl and lower -2-oxyl.

a bicycloalkyl-alkyl or alkoxy group having 6 to 15 carbon atoms is an alkyl group or alkoxy group substituted with a bicycloalkyl group and a total of 6 to 15 carbon atoms; Alkan-2-methyl and lower Base-2-methoxy.

a bicycloalkenyl group having 6 to 15 carbon atoms, for example, Alkenyl Dienyl. Better is descending Alkenyl, especially lower -5-alkenyl.

The bicycloalkenyl alkoxy group having 6 to 15 carbon atoms is alkoxy group substituted with a bicycloalkenyl group and the total number of carbon atoms is 6 to 15, for example, -5-ene-2-methoxy.

The tricycloalkyl group having 6 to 15 carbon atoms is, for example, 1-adamantyl or 2-adamantyl. Preferred is 1-adamantyl.

The tricycloalkoxy group having 6 to 15 carbon atoms is, for example, an adamantyloxy group. a heteroaryl group having 3 to 12 carbon atoms, preferably a pyridyl group, a pyrimidinyl group or a third group Base, pyrrolyl, furyl, thiophenyl or quinolyl.

The compound represented by the general formula (VII-A) is preferably an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, and a carbon number of 3 to 12, wherein R ¹ represents an alkyl group having 1 to 18 carbon atoms. Alkenyl group, phenyl group; phenyl group, OH, alkoxy group having 1 to 18 carbon atoms, cycloalkoxy group having 5 to 12 carbon atoms, alkenyloxy group having 3 to 18 carbon atoms, halogen Atom, -COOH, -COOR ⁴ , -O-CO-R ⁵ , -O-CO-O-R ⁶ , -CO-NH ₂ , -CO-NHR ⁷ , -CO-N(R ⁷ )(R ⁸ ), CN, NH ₂ , NHR ⁷ , -N(R ⁷ )(R ⁸ ), -NH-CO-R ⁵ , phenoxy group, phenoxy group substituted with an alkyl group having 1 to 18 carbon atoms, benzene Alkoxy group having 1 to 4 carbon atoms, Oxygen, drop Alkene-2-yloxy Base-2-methoxyl -5-ene-2-methoxy, adamantyloxy group-substituted alkyl group having 1 to 18 carbon atoms; OH, an alkyl group having 1 to 4 carbon atoms, and 2 to 6 carbon atoms; An alkenyl group or a cycloalkyl group having 5 to 12 carbon atoms substituted with -O-CO-R ⁵ ; a glycidyl group; -CO-R ⁹ or -SO ₂ -R ¹⁰ ; or an R ^{1 group} representing 1 The alkyl group having 3 to 50 carbon atoms which is interrupted by an oxygen atom and/or substituted with an OH group, a phenoxy group or an alkylphenoxy group having 7 to 18 carbon atoms; or an R ¹ group represents - A; -CH ₂ -CH(XA)-CH ₂ -O-R ¹² ;-CR ¹³ R' ¹³ -(CH ₂ ) _m -X-A; -CH ₂ -CH(OA)-R ¹⁴ ;-CH ₂ -CH(OH)-CH ₂ -XA; -CR ¹⁵ R' ¹⁵ -C(=CH ₂ )-R" ¹⁵ , -CR ¹³ R' ¹³ -(CH ₂ ) _m -CO-X-A, -CR ¹³ R' ¹³ -(CH ₂ ) _m - CO-O-CR ¹⁵ R' ¹⁵ -C(=CH ₂ )-R" ¹⁵ or -CO-O-CR ¹⁵ R' ¹⁵ -C(=CH ₂ )-R" ¹⁵ (wherein A represents - One of the definitions of CO-CR ¹⁶ =CH-R ¹⁷ ); the base R ² represents an alkyl group having 6 to 18 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, a phenyl group, and -O-R ³ or -NH-CO-R ⁵ ; and R ³ independently of each other represents a definition given for R ¹ ; R ⁴ represents an alkyl group having 1 to 18 carbon atoms and an alkyl group having 3 to 18 carbon atoms; a group, a phenyl group, a phenylalkyl group having 7 to 11 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms; or an R ⁴ group representing -O-, -NH-, -NR ^{7 having} 1 or more -, -S-interrupted and alkyl having 3 to 50 carbon atoms substituted with OH, phenoxy or an alkylphenoxy group having 7 to 18 carbon atoms; R ⁵ represents a carbon atom An alkyl group of 1 to 18, an alkenyl group having 2 to 18 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, a phenyl group, a phenylalkyl group having 7 to 11 carbon atoms, and a lowering ratio Alkene-2-yl, descending -5-Aken-2-yl, adamantyl; R ⁶ represents H, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 3 to 18 carbon atoms, a phenyl group, and a carbon number of 7~ a phenylalkyl group of 11 and a cycloalkyl group having 5 to 12 carbon atoms; and R ⁷ and R ⁸ each independently represent an alkyl group having 1 to 12 carbon atoms and an alkoxy group having 3 to 12 carbon atoms; An alkyl group, a dialkylaminoalkyl group having 4 to 16 carbon atoms, or a cycloalkyl group having 5 to 12 carbon atoms; or R ⁷ and R ⁸ together representing a carbon number of 3 to 9 An alkyl group, an oxaalkylene group having 3 to 9 carbon atoms or an azaalkylene group having 3 to 9 carbon atoms; and R ⁹ represents an alkyl group having 1 to 18 carbon atoms, and the number of carbon atoms is 2 to 18 alkenyl group, phenyl group, cycloalkyl group having 5 to 12 carbon atoms, phenylalkyl group having 7 to 11 carbon atoms, Alkene-2-yl, descending -5-Aken-2-yl, adamantyl; R ¹⁰ represents an alkyl group having 1 to 12 carbon atoms, a phenyl group, a naphthyl group or an alkylphenyl group having 7 to 14 carbon atoms; ^{The 11} series represents mutually independent H, an alkyl group having 1 to 18 carbon atoms, or a phenylalkyl group having 7 to 11 carbon atoms; and R ¹² represents an alkyl group having 1 to 18 carbon atoms and a carbon atom. The number is 3 to 18 alkenyl groups, phenyl group, alkyl group having 1 to 8 carbon atoms, alkoxy group having 1 to 8 carbon atoms, alkenyloxy group having 3 to 8 carbon atoms, halogen atom Or a trifluoromethyl group substituted 1-3 times phenyl; or a phenylalkyl group having 7 to 11 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, 1-adamantyl group, 2-gold gang Alkyl, descending Base Alk-2-yl-, -CO-R ⁵ ; or R ¹² represents an interrupt of 1 -O-, -NH-, -NR ⁷ -, -S- and OH, phenoxy Or an alkyl group having 7 to 18 carbon atoms substituted with an alkyl group having 3 to 50 carbon atoms; and R ¹³ and R' ¹³ are each independently representing H and an alkyl group having 1 to 18 carbon atoms. , phenyl; R ¹⁴ represents an alkyl group having 1 to 18 carbon atoms, an alkoxyalkyl group having 3 to 12 carbon atoms, a phenyl group, a phenyl group; an alkyl group having 1 to 4 carbon atoms; R ¹⁵ , R' ¹⁵ and R" ¹⁵ are each independently representing H or CH ₃ ; R ¹⁶ represents H, -CH ₂ -COO-R ⁴ , an alkyl group having 1 to 4 carbon atoms, or CN; ^{The 17} series represents H, -COOR ⁴ , an alkyl group having 1 to 17 carbon atoms, or a phenyl group; the X system represents -NH-, -NR ⁷ -, -O-, -NH-(CH ₂ ) _p -NH -, or -O-(CH ₂ ) _q -NH-; and the index m represents an integer from 0 to 19; n represents an integer from 1 to 8; p represents an integer from 0 to 4; q represents 2, 3 , or 4.

The compound represented by the general formula (VII) and the general formula (VII-A) can be produced by a known method. For example, it may be in accordance with the method shown in the publication of European Patent No. 434608 or H. Brunetti and CE Luthi, Helv. Chim. Acta 55, 1566 (1972), or by the same halogen for phenol The Friedel-Crafts addition is obtained in the same manner as the known compound.

Next, preferred examples of the compound represented by the general formula (VII) and the general formula (VII-A) are exemplified below, but the compound used in the first aspect of the present invention may not be limited to the specific ones thereof. Just an example.

In addition, it is also possible to use a light stabilizer which is described in the catalogue of "Adekaastave" which is a summary of the addition of plastics and plastics. It is also possible to use a light stabilizer and an ultraviolet absorber described in the introduction of the Vauban product of Ciba Specialty Chemicals. It is also possible to use SEESORB, SEENOX, SEETEC, etc. described in the catalog of SHIPRO Chemicals. It is also possible to use UV absorbers and oxidation inhibitors of Chengbei Chemical Industry. It is also possible to use the VIOSORB of the common medicine and the ultraviolet absorber of Jifu Pharmaceutical.

In addition, the disc-shaped compound described in JP-A-2001-166144 and JP-A-2003-3446556 is also preferably used as the above-mentioned wavelength dispersion controlling agent, and thus can be used.

(hysteresis reducing agent) The above-mentioned polymer film is preferably at least one type containing a compound having a function of reducing hysteresis (particularly, Rth) (hereinafter, simply referred to as "Rth reducing agent"); more preferably in the above 250~ At least one of a wavelength dispersion controlling agent having a maximum absorption in a wavelength range of 400 nm and at least one of a substance having a function of reducing hysteresis.

In the case where the polymer film used in the first aspect of the present invention is a low hysteresis deuterated cellulose film, the wavelength dispersion controlling agent preferably contains a compound having high affinity with the deuterated cellulose film.

The hysteresis reducing agent in the first aspect of the present invention is a compound represented by the following formula (1-A) or formula (1-B), but it is preferred that the hysteresis reduction effect is large.

Hereinafter, the compound represented by the formula (1-A) will be described in detail.

In the formula (1-A), R ⁴ , R ⁵ and R ⁶ each represent a substituted or unsubstituted alkyl group.

In the above formula (1-A), R ⁴ , R ⁵ and R ⁶ each represent a substituted or unsubstituted alkyl group. Here, the alkyl group may be a straight chain, a branch, or even a ring. The alkyl group is preferably a substance having 1 to 20 carbon atoms, more preferably 1 to 15 or more preferably 1 to 12. A cyclic alkyl group, particularly preferably a cyclohexyl group.

The alkyl group in the above formula (1-A) may have a substituent. The substituent is preferably a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom or an iodine atom), an alkyl group, an alkoxy group, a decyl group, an alkoxycarbonyl group, a decyloxy group, a sulfonylamino group, a hydroxyl group or a cyanogen group. The group, the amine group and the mercaptoamine group; more preferably a halogen atom, an alkyl group, an alkoxy group, a sulfonylamino group and a mercaptoamine group, particularly preferably an alkyl group or a sulfonylamino group.

Next, preferred examples of the compound represented by the formula (1-A) are shown below, but the compound used in the first aspect of the invention is not limited to the specific examples thereof.

Any of the above compounds can be produced by a known method. That is, the compound represented by the formula (1-A) can be subjected to a dehydration condensation reaction between a carboxylic acid and an amine using a condensing agent (for example, dicyclohexylcarbonyldiimide (DCC) or the like), or It is obtained by a substitution reaction between a carboxylic acid chloride derivative and an amine derivative.

Next, the compound represented by the formula (1-B) will be explained.

In the formula (1-B), R ¹ and R ² each represent an alkyl group or an aryl group.

The sum of the number of carbon atoms of R ¹ and R ² is particularly preferably 10 or more. The substituent is preferably a fluorine atom, an alkyl group, an aryl group, an alkoxy group, a sulfonic acid group or a sulfonylamino group, and particularly preferably an alkyl group, an aryl group, an alkoxy group, a sulfonic acid group or a sulfonylamino group. Further, the alkyl group may be a straight chain, a branch, or even a ring, and is preferably a substance having 1 to 25 carbon atoms, more preferably 6 to 25, and particularly preferably 6 to 20 (eg, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, isopentyl, tert-pentyl, hexyl, cyclohexyl, heptyl, Octyl, bicyclooctyl, decyl, adamantyl, fluorenyl, tert-octyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecane Base, heptadecyl, octadecyl, nonadecyl, eicosyl).

As the aryl group, it is preferably a carbon number of 6 to 30, particularly preferably 6 to 24 (for example, phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, triphenyl) Phenylphenyl).

Next, preferred examples of the compound represented by the formula (1-B) are shown below, but the compound used in the first aspect of the invention is not limited to the specific examples thereof. Here, Pr ⁱ represents an isopropyl group.

The above polymer film is preferably a deuterated cellulose film produced by a solvent casting method. The solvent casting method is a dope liquid prepared by dissolving deuterated cellulose in an organic solvent, casting on a surface of a support, and drying to form a film. After the film formation, a stretching treatment may be performed in order to obtain desired optical characteristics. In the case of preparing a cellulose-based film by a solvent casting method, the above-mentioned wavelength dispersion controlling agent and Rth reducing agent may be dissolved in, for example, an alcohol or dichloromethane, After the organic solvent of the alkane, the deuterated cellulose solution is further added, or may be directly added to the coating liquid composition. Further, the deuterated cellulose may not be added to the coating liquid, and may be added at any point of the casting. In the latter case, a coating liquid obtained by dissolving deuterated cellulose in a solvent and dissolving the above-mentioned wavelength dispersion controlling agent and/or Rth reducing agent in a solvent may be added or mixed in line. Medium adjusted solution. For on-line addition or mixing, for example, an in-line mixer such as a static mixer (manufactured by Toray Engineering Co., Ltd.), a SWJ (Toray static in-line mixer, Hi-Mixer), or the like is preferably used. In the solution of the wavelength dispersion controlling agent and the Rth reducing agent to be added later, other additives such as a matting agent, a plasticizer, an anti-deterioration agent, and a peeling accelerator may be simultaneously mixed. In the case of using an in-line mixer, it is preferred to carry out concentration and dissolution under high pressure, and it is preferable to carry out heating and stirring under pressure as long as it can withstand a predetermined pressure as long as it can withstand a predetermined pressure. As the pressurized container, a meter such as a pressure gauge or a thermometer that is appropriately equipped may be used. The pressurization system can be carried out by injecting an inert gas such as nitrogen gas or by heating to increase the vapor pressure of the solvent. The heating is preferably carried out from the outside, for example, it is preferably a sleeve type because temperature control is easy. The heating temperature of the solvent to be added is preferably a temperature within a range in which the boiling point of the solvent is used and the solvent does not boil. For example, it is preferably set in the range of 30 to 150 °C. Further, the pressure system can be adjusted in such a manner that the solvent does not boil at the set temperature. After the dissolution, it may be taken out from the container while cooling, or may be taken out from the container by a pump, cooled by a heat exchanger or the like, and supplied to the film former. Although the cooling temperature at this time can be cooled to room temperature, it is cooled to a temperature lower by 5 to 10 ° C than the boiling point, and the flow is delayed at such a temperature, because the viscosity of the coating liquid can be reduced, which is more preferable.

Further, the wavelength dispersion controlling agent may be used singly or in combination of two or more types. The amount of the above-mentioned wavelength-dispersing controlling agent is preferably 1.0 to 20% by mass, more preferably 1.5 to 15% by mass, and most preferably 2.0 to 10% by mass based on 100 parts by mass of the fluorinated cellulose. Further, the above Rth reducing agent may be used singly or in combination of two or more types. The amount of the Rth reducing agent to be added is preferably from 1 to 30% by mass, more preferably from 2 to 30% by mass, most preferably from 5 to 20% by mass, based on 100 parts by mass of the deuterated cellulose.

[Optical anisotropic layer] The optically anisotropic layer having the optical compensation film according to the first aspect of the present invention preferably has substantially no in-plane retardation, has a negative refractive index anisotropy, and is in the normal direction. A layer with an optical axis.

The retardation (Rth) in the thickness direction of the optical anisotropic layer is preferably 60 to 260 nm, more preferably 80 to 220 nm, and particularly preferably 100 to 180 nm. By making Rth within the above range, an optical compensation film having no unevenness and high Rth can be realized.

Further, the value Rth/d of the retardation Rth in the thickness direction of the optically anisotropic layer divided by the film thickness d is preferably 0.065 to 0.160, more preferably 0.075 or more, still more preferably 0.085 or more. Further, it is preferably 0.15 or less, more preferably 0.14 or less. The in-plane retardation Re should be 0~10 nm, preferably 0~5 nm. Such an optically oriented layer has an advantageous point that unevenness is less likely to occur when continuously applied to a long support.

In addition, the wavelength dispersibility Rth(450)/Rth(550) of the optically anisotropic layer is preferably 1.09 or more, more preferably 1.12 or more, still more preferably 1.15 or more, and particularly preferably 1.18 or more. When this condition is satisfied, the above-mentioned wavelength dispersion characteristics of the optical compensation film can be found on the polymer film of the support, and the liquid crystal display element, particularly the VA mode liquid crystal display element, can be compensated across the visible light.

The material of the aforementioned optically anisotropic layer is not particularly limited. A preferred example of the optically anisotropic layer is an optically anisotropic layer formed of a polymerizable composition containing a liquid crystal compound. An optically anisotropic layer having an optically negative refractive index anisotropy and having an optical axis in a normal direction of the layer, for example, a polymerizable composition containing a rod-like liquid crystal compound can be regarded as an optically active nematic type ( The cholesteric liquid crystal phase is formed by curing by polymerization. Further, the polymerizable composition containing the discotic liquid crystal compound can be a liquid crystal phase in which the molecules of the discotic liquid crystal compound are aligned so that the disk surface is horizontally aligned (vertical alignment) with respect to the layer, and is polymerized. Hardened to form.

<<Optical Anisotropic Layer by Vertical Alignment of Disc Liquid Crystals>> The optically anisotropic layer is preferably a material formed of a polymerizable composition containing a discotic liquid crystalline compound. The above-mentioned polymerizable composition is preferably a "horizontal alignment agent" which will be described later to contain at least one of the horizontal alignment (vertical alignment) of the discotic liquid crystal compound. The dish-like liquid crystal compound can be aligned in the presence of at least one of the "horizontal alignment agents" described later, and the disk surface thereof is aligned to be substantially horizontal with respect to the layer. The term "substantial level" means that the average angle (average tilt angle) between the disk surface of the discotic liquid crystalline compound and the layer of the optically anisotropic layer is in the range of 0 to 10 degrees.

The liquid crystal compound which can be used for the formation of the optically anisotropic layer can be obtained from various documents (C. Destrade et al., Molecular Liquid Crystal, Vol. 71, p. 111 (1981); Nipponization Society, Quarterly Chemistry, Volume 22, Liquid Crystal Chemistry, Chapter 5, Chapter 10, Section 2 (1994); B. Kohn et al., Angew. Chemical Association, Chemical Communication, 1794 (1985); It is selected from various substances described in J. Zhang et al., Journal of the American Chemical Society, Vol. 116, p. 2655 (1994). For the polymerization of the discotic liquid crystalline compound, for example, the method described in JP-A-8-27284 can be employed.

The discotic liquid crystalline compound used for the formation of the optically anisotropic layer preferably has a polymerizable group which can be fixed by polymerization. For example, a structure in which a polymerizable group as a substituent is bonded to a disk-shaped core of a discotic liquid crystalline compound can be considered. Moreover, it is more preferable that the disk-shaped core and the polymerizable group have a linking group. When a structure having a linking group is employed, it becomes easier to maintain the alignment state in the polymerization reaction. The discotic liquid crystalline compound having a polymerizable group is preferably a compound represented by the following general formula (VI).

General formula (VI) D(-L-P)n

In the general formula (VI), D is a disc-shaped core, L is a divalent linking group, P is a polymerizable group, and n is an integer of 4 to 12.

Specific examples of the disc-shaped core (D), the divalent linking group (L), and the polymerizable group (P) in the above formula (VI) are as disclosed in JP-A-2001-4837, respectively. (D1) to (D15), (L1) to (L25), and (P1) to (P18) are exemplified.

In the case of using a discotic liquid crystalline compound having a polymerizable group, as in the above description of the first aspect of the present invention, it is preferably a substantially horizontal alignment. Specific examples of the discotic liquid crystalline compound having a polymerizable group capable of horizontal alignment are preferably applicable to the international publication WO 01/88574 A1, page 58 line 6 to page 65, line 8. Those recorded on the above.

The wavelength dispersibility of the optically anisotropic layer described above is preferably high (for example, the Rth system becomes larger with wavelength). Examples of the discotic liquid crystal compound capable of forming an optically anisotropic layer having a high wavelength dispersibility include, for example, the compounds exemplified in JP-A-2001-166147 [0050] to [0142]. Among these, it is preferred that the compound represented by the general formula (I) in [0050] of the publication is more preferably a compound represented by the general formula (Ia) in [0067], and more preferably The same compound of the discotic liquid crystal compound (II) used in the examples described later and the like (the length of the vinyl group is about 2 to 6).

When the optically anisotropic layer is formed, it is preferred to orient the discotic liquid crystalline compound in the presence of at least one of the "horizontal alignment agents". In addition, the "horizontal alignment" in the first aspect of the present invention means that the long axis direction of the molecules of the discotic liquid crystalline compound (that is, the disk surface of the core) is parallel to the horizontal plane of the liquid crystal layer (for example, In the case where the liquid crystal layer is formed on the support, it is the surface of the support; however, it is not required to be strictly parallel. In the present description, as described above, the disc face and the horizontal plane of the core are referred to. The inclination angle formed between them is an orientation of 10 degrees or less. The inclination angle is preferably 5 degrees or less, more preferably 3 degrees or less, more preferably 2 degrees or less, and most preferably 1 degree or less. The aforementioned tilt angle may also be 0 degrees.

For the above-mentioned horizontal alignment agent, for example, a compound exemplified in JP-A-2005-128050 [0049] to [0082], or a repeating unit derived from a fluoroaliphatic-containing monomer, and the following may be used. A copolymer of repeating units represented by the general formula (a). In the first aspect of the present invention, it is preferred to use a copolymer having a repeating unit derived from a fluoroaliphatic-containing monomer and a repeating unit represented by the following general formula (a) (hereinafter, some cases will be This copolymer is referred to as "Polymer A" as a leveling agent. Further, the polymer A may be added to the composition when the optically anisotropic layer is formed using a rod-like liquid crystal compound to be described later.

In the above general formula (a), R ¹ , R ² and R ³ each represent a hydrogen atom or a substituent. Q has a carboxyl group (-COOH) having at least one phenyl group or a salt thereof, a sulfonic acid group (-SO ₃ H) or a salt thereof, a phosphonic acidoxy group {-OP(=O)(OH) ₂ } or Salt, hydrophilic group (-OH), or acrylamide (-NR ⁴ - (R ⁴ represents a hydrogen atom, an alkyl group, an aryl group or an aralkyl group)). L represents a divalent linking group formed by any one selected from the following linking groups or a combination of two or more of them.

(linking group) single bond, -O-, -CO-, -S-, -SO ₂ -, -P(=O)(OR ⁵ )-(R ⁵ represents an alkyl group, an aryl group or an aralkyl group ), alkyl, aryl.

In the general formula (a), R ² and R ³ each independently represent a hydrogen atom or a substituent selected from the group of substituents exemplified below. More preferably, it is a hydrogen atom, and R ¹ is preferably a hydrogen atom or a methyl group.

(Substituent group) an alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably an alkyl group having 1 to 8 carbon atoms; for example, for example, It is methyl, ethyl, isopropyl, tert-butyl, n-octyl, n-fluorenyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), alkenyl ( Preferably, the number of carbon atoms is 2 to 20, more preferably 2 to 12 carbon atoms, and particularly preferably 2 to 8 carbon atoms; for example, it is a vinyl group, an aryl group, 2-butenyl, 3-pentenyl, etc., alkynyl (preferably having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, and particularly preferably 2 to 8 carbon atoms) An alkynyl group; for example, a propynyl group, a 3-pentynyl group, or the like, an aryl group (preferably having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms). An aryl group having 6 to 12 carbon atoms; for example, a phenyl group, a p-methylphenyl group, a naphthyl group or the like, or an aralkyl group (preferably having 7 to 30 carbon atoms) More preferably, it is an aralkyl group having 7 to 20 carbon atoms, particularly preferably 7 to 12 carbon atoms; for example, it is a benzyl group, a phenethyl group, or 3 A phenylpropyl group, a substituted or unsubstituted amino group (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 10, particularly preferably a carbon number of 0 to 6) An amine group; for example, it is an unsubstituted amino group, a methylamino group, a dimethylamino group, a diethylamino group, an anilino group, etc.), an alkoxy group (more preferably a carbon number) It is 1 to 20, more preferably an alkoxy group having 1 to 16 carbon atoms, particularly preferably 1 to 10 carbon atoms; for example, it is a methoxy group, an ethoxy group or a propoxy group. And the alkoxycarbonyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably an alkoxycarbonyl group having 2 to 10 carbon atoms; For example, it is a methoxycarbonyl group, an ethoxycarbonyl group or the like), a decyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, and particularly preferably having a carbon number of 2) 2 to 10 methoxy groups; for example, it is an ethoxycarbonyl group, a benzyl methoxy group, etc.), a mercaptoamine group (preferably having 2 to 20 carbon atoms, more preferably a carbon atom) The number is 2 to 16, particularly preferably a mercaptoamine group having 2 to 10 carbon atoms; for example, it is an acetamidine Alkoxy group, benzhydrylamino group, etc.), alkoxycarbonylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, and particularly preferably 2 carbon atoms) An alkoxycarbonylamino group of ~12; for example, it is a methoxycarbonylamino group or the like), an aryloxycarbonylamino group (preferably having a carbon number of 7 to 20, more preferably a carbon atom) The number is 7 to 16, particularly preferably an aryloxycarbonylamino group having 7 to 12 carbon atoms; for example, it is a phenoxycarbonylamino group, etc.), a sulfonylamino group (preferably The number of carbon atoms is from 1 to 20, more preferably a sulfonylamino group having from 1 to 16 carbon atoms, particularly preferably from 1 to 12 carbon atoms; for example, it is a methanesulfonylamino group. , benzenesulfonylamino group, etc.), sulfonamide (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 16, particularly preferably an amine having a carbon number of 0 to 12) a mercapto group; for example, it is an aminosulfonyl group, a methylaminesulfonyl group, a dimethylaminesulfonyl group, a phenylaminesulfonyl group, etc.), an amine formamidine group (preferably The number of carbon atoms is from 1 to 20, more preferably from 1 to 16 carbon atoms, and particularly preferably from 1 to 12 carbon atoms. For example, it is unsubstituted amine methotrexate, methylamine methamine, dimethylamine carbamide, phenylamine carbamide, etc., alkylthio (suitable It is an alkylthio group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, and particularly preferably 1 to 12 carbon atoms; for example, it is a methylthio group or an ethylthio group. And the arylthio group (preferably having 6 to 20 carbon atoms, more preferably 6 to 16 carbon atoms, and particularly preferably an arylthio group having 6 to 12 carbon atoms; for example, for example, It is a phenylthio group, etc., a sulfonyl group (preferably having a carbon number of 1 to 20, more preferably a carbon number of 1 to 16, and particularly preferably a sulfonyl group having 1 to 12 carbon atoms; For example, it is a methanesulfonyl group, a toluenesulfonyl group, etc., and a sulfinyl group (preferably, the number of carbon atoms is 1 to 20, more preferably 1 to 16, and particularly preferably 1 to 12). a sulfonyl group; for example, it is a sulfinyl group, a sulfinyl group, or the like; a urea group (preferably having a carbon number of 1 to 20, more preferably 1 to 16, particularly preferably a ureido group of 1 to 12, for example, an unsubstituted ureido group, a methylureido group, a phenylureido group, or the like, or a guanidinium phosphate group ( It is preferably a guanidinium phosphate having 1 to 20 carbon atoms, more preferably 1 to 16, and particularly preferably 1 to 12, for example, it is diethylphosphonium amide, phenylphosphoric acid amide Base, etc.), a hydroxyl group, a hydrogenthio group, a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom), a cyano group, a sulfonic acid group, a carboxyl group, a nitro group, a hydroxamic acid group, a sulfinic acid group, A mercapto group, an imido group or a heterocyclic group (preferably a heterocyclic group having 1 to 30 carbon atoms, more preferably 1 to 12 carbon atoms, for example, a hetero atom having a nitrogen atom, an oxygen atom or a sulfur atom; a ring group, for example, which is an imidazolyl group, a pyridyl group, a quinolyl group, a furyl group, a piperidinyl group, a morpholinyl group, a benzoxazolyl group, a benzimidazolyl group, a benzothiazolyl group, etc.) The decyl group (preferably having a carbon number of 3 to 40, more preferably 3 to 30, particularly preferably 3 to 24 is an alkyl group, for example, it is a trimethyldecyl group or a triphenyldecane. Base, etc.). These substituents may be further substituted by the above substituents. Further, in the case of having two or more substituents, they may be the same or different. Further, if possible, they may be connected to each other to form a ring.

R ¹ , R ² and R ³ preferably each independently represent a hydrogen atom, an alkyl group, a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom or the like), or a -L-Q as described later. The base represented by the group; more preferably hydrogen, an alkyl group having 1 to 6 carbon atoms, a chlorine atom, or a group represented by -L-Q; more preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; Particularly preferred is a hydrogen atom and an alkyl group having 1 to 2 carbon atoms; preferably, R ² and R ³ are a hydrogen atom, and R ¹ is a hydrogen atom or a methyl group. Specific examples of the alkyl group include, for example, a methyl group, an ethyl group, an n-propyl group, an n-butyl group, a sec-butyl group and the like. The alkyl group may also have a suitable substituent. The substituent, for example, may be a halogen atom, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, a decyl group, a hydroxyl group, a decyloxy group, an amine group. An alkoxycarbonyl group, a mercaptoamine group, an oxycarbonyl group, an amine formamidine group, a sulfonyl group, an amine sulfonyl group, a decylamino group, a thiol group, a carboxyl group or the like. Further, the number of carbon atoms of the alkyl group does not include the carbon atom of the substituent. Hereinafter, the number of carbon atoms of other substituents is also the same.

L represents a divalent linking group formed by combining two or more of the two-valent linking groups selected from the above-mentioned linking group. In the above-mentioned linking group, R ⁴ of -NR ⁴ - represents a hydrogen atom, an alkyl group, an aryl group or an aralkyl group, and preferably represents a hydrogen atom or an alkyl group. Further, R ⁵ of -PO(OR ⁵ )- represents an alkyl group, an aryl group or an aralkyl group, and more preferably represents an alkyl group. The number of carbon atoms in the case where R ⁴ and R ⁵ represent an alkyl group, an aryl group or an aralkyl group is the same as those described in the "substituent group". L preferably includes a single bond, -O-, -CO-, -NR ⁴ -, -S-, -SO ₂ -, alkylene or aryl; particularly preferably includes a single bond, -CO-, - O-, -NR ⁴ -, alkylene or aryl; preferably including -CO-, -O-, -NR ⁴ -, alkylene or aryl. In the case where L is an alkylene group, the number of carbon atoms of the alkyl group is preferably from 1 to 10, more preferably from 1 to 8, particularly preferably from 1 to 6; a specific example of a particularly extended alkyl group, for example For example, it is a methylene group, an ethyl group, a trimethylene group, a tetrabutylene group, a hexamethylene group or the like. In the case where L is an extended aryl group, the number of carbon atoms of the aryl group is preferably 6 to 24, more preferably 6 to 18, and particularly preferably 6 to 12; a specific example of a particularly excellent aryl group, for example For example, it is a phenylene group, a naphthyl group or the like. In the case where L is a divalent linking group (ie, an aralkyl group) obtained by a combination of an alkyl group and an aryl group, the number of carbon atoms of the aralkyl group is preferably 7 to 34, more preferably 7 ~26, particularly preferably 7 to 16; a specific example of the particularly preferred aralkyl group, for example, is a phenylmethylene group, a phenylethyl group, a methylene group, and the like. The group listed as L may have an appropriate substituent. Such a substituent, for example, may be the same as those exemplified as the substituents previously as R ¹ to R ³ .

Hereinafter, the specific structure of L is exemplified, but the compound used in the first aspect of the present invention is not limited to these.

In the following, specific examples of the monomer corresponding to the above formula (a) which can be used in the production of the above-mentioned fluorine-based polymer are listed, but are not limited to the following specific examples.

The above-mentioned polymer A may be one type of repeating unit represented by the above general formula (a), or two or more types may be contained. In addition, the polymer A may contain one or two or more kinds of repeating units derived from the fluoroaliphatic group-containing monomer. The above-mentioned polymer A is preferably a repeating unit derived from a fluoroaliphatic group-containing monomer represented by the general formula [1] described in JP-A-2004-333861.

In the formula, R ¹ represents a hydrogen atom or a methyl group; X represents an oxygen atom, a sulfur atom or -N(R ¹² )-, Hf represents a hydrogen atom or a fluorine atom, and m represents an integer of 1 or more and 6 or less, n The system represents an integer from 2 to 4. The R ^{12 group} represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Furthermore, the aforementioned polymer A may contain other repeating units than these. The other repeating unit described above is not particularly limited. For example, a preferred example is a repeating unit derived from a conventional monomer capable of free polymerization. The above-mentioned polymer A may contain one type of the repeating unit derived from the monomer group described in [0032] to [0044] of JP-A-2004-333861, or may contain two or more types.

The mass average molecular weight of the polymer A used in the first aspect of the present invention is preferably 1,000,000 or less, more preferably 500,000 or less, and still more preferably 5,000 or more and 50,000 or less. The mass average molecular weight can be determined by measuring the value converted to polystyrene (PS) by using a gel dialysis chromatograph (GPC).

The polymerization method to be used in the production of the polymer A described above is not particularly limited, but the method described in JP-A-2004-46038 (0035) to [0041] is preferably used.

Further, the polymer A described above may be a polymerizable group having a substituent as a substituent in order to fix the alignment state of the liquid crystal compound.

In the first aspect of the present invention, the "addition amount" of the "horizontal alignment agent" is preferably 0.01 to 20% by mass, more preferably 0.05 to 10% by mass, based on the amount of the liquid crystalline compound. 0.1 to 5 mass%. In addition, the above-mentioned "horizontal alignment agent" may be used singly or in combination of two or more.

<<Optical anisotropic layer formed by using a cholesteric liquid crystal phase>> The optically anisotropic layer is preferably a layer formed by using a cholesteric liquid crystal phase. Such an optically anisotropic layer can be formed by polymerizing a polymerizable compound containing a rod-like liquid crystalline compound as a cholesteric liquid crystal phase by polymerization. Further, the spiral axis of the cholesterol alignment is preferably substantially perpendicular (normal direction) to the surface of the optically anisotropic layer.

In order to obtain a cholesteric liquid crystal phase, an optically active rod-like liquid crystal compound or a mixture of a rod-like liquid crystal compound and an optically active compound may be used. The use of a mixture of a rod-like liquid crystalline compound and an optically active compound is suitable for the adjustment of the helical pitch of the cholesterol alignment.

Examples which can be used for the rod-like liquid crystalline compound include azomethine (methimine), azobenzene, cyanide, cyanophenyl, benzoate, and ring. Phenyl hexane carboxylate, cyanophenyl cyclohexane, cyano substituted phenyl pyrimidine, alkoxy substituted phenyl pyrimidine, phenyl dioxane, tolane and tolane Alkenylcyclohexylbenzonitriles.

Preferably, the molecules of the rod-like liquid crystalline compound are fixed in an aligned state in the optically anisotropic layer. More preferably, the molecular alignment state of the rod-like liquid crystalline compound is fixed by polymerization. The rod-like liquid crystalline compound is preferably a compound having a polymerizable group.

Examples of polymerizable rod-like liquid crystalline compounds which can be used are included in Macromolecular Chemistry, Vol. 190, p. 2255 (1989), Advanced Materials, Vol. 5, p. 107 (1993), U.S. Patent No. 4683327 No. 5,622,648, US Patent No. 5,770,107, International Publication No. WO 95/22586, International Publication No. WO 95/24455, International Publication No. WO 97/00600, International Publication WO 98/23580 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The compounds described in, for example, JP-A-2005-240228, JP-A-2005-99237, JP-A-2005-129237, JP-A-2005-121827, and JP-A-2002-30042.

Further, examples of the above-mentioned optically active (chiral) agent include the optically active agents represented by the general formula [Chemical Formula 12] to [Chemical Formula 14] described in [0047] to [0049] of JP-A-2004-326089. .

When incident light parallel to the helical axis of the cholesterol alignment, a light wavelength of a value equal to the product (nc. P) of the average refractive index (nc) of the liquid crystalline compound and the helical pitch (P) of the cholesterol alignment is generated. As a center of choice reflection. According to the method of making the selective reflection contain a wavelength shorter than the wavelength of visible light, that is, according to nc. The value of P falls outside the visible light to select the material or pitch. The control of the pitch can be easily carried out by controlling the amount of the optically active compound used together with the liquid crystalline compound or controlling the number of optically active sites present in the molecule of the liquid crystalline compound.

The spiral pitch (P) of the cholesteric liquid crystal is preferably 10 to 300 nm, more preferably 50 to 200 nm. Also, the spiral pitch (P) of the cholesteric liquid crystal, as long as it is nc. The value of P may be outside the visible light region, and it does not matter even if it is dispersed.

In the case where the optically anisotropic layer is formed by using a composition containing a liquid crystal compound, it is preferred to fix the molecules of the aligned liquid crystal compound while maintaining their alignment. The immobilization is preferably carried out by a polymerization reaction of a polymerizable group of a liquid crystal compound. The polymerization reaction, although it involves a thermal polymerization reaction using a thermal polymerization initiator, and a photopolymerization reaction using a photopolymerization initiator, is more preferably a photopolymerization reaction. Examples of photopolymerization initiators that can be used include α-carbonyl compounds (described in the specification of U.S. Patent No. 2,276,661, U.S. Patent No. 2,367,670), and Ether Ether (U.S. Patent No. 2,448,828). a substance described in the specification), an α-hydrocarbon-substituted aromatic aryl compound (the one described in the specification of U.S. Patent No. 2,722,512), a polynuclear quinoline compound (U.S. Patent No. 3,046,127, U.S. Patent No. 2,951,758) a combination of a triaryl imidazole dimer and a p-aminobenzophenone (as described in the specification of U.S. Patent No. 3,549,367), an acridine and a pyridinium compound (described in each specification) And the contents described in the specification of U.S. Patent No. 4,239, 880, and An oxadiazole compound (as described in the specification of U.S. Patent No. 4,212,970).

The optically anisotropic layer of the optical compensation film according to the first aspect of the present invention preferably has a high Rth. However, in order to increase Rth, the film thickness of the optically anisotropic layer is further increased. Thick need. Therefore, the UV light at the time of UV hardening is attenuated in the lower layer. For the purpose of correction, it is preferred to use a photopolymerization initiator having a high light diffusing property in the long wavelength domain and generating a radical, and more specifically, it is preferable to use a photosensitive region at 330 nm. A range of 450 nm, a halogen radical or a hydrocarbon radical having an atomic number of 8 or less is used as a polymerization starting radical. The halogen radical, for example, although it may be a radical of fluorine, chlorine, bromine or iodine, is particularly preferably a chlorine radical. The hydrocarbon radical having 8 or less atoms other than hydrogen may be a hydrocarbon radical having a substituent such as a halogenated hydrocarbon radical, and for example, it may be a methyl radical, an ethyl radical, or a C. A radical, a butyl radical, a phenyl radical, a tolyl radical, a chlorophenyl radical, a bromophenyl radical, a benzinyl radical, or the like. The matching of the light-sensing wavelength and the light source is a necessary condition for high sensitivity. A photopolymerization initiator having a photosensitive region of from 330 nm to 450 nm has good compatibility with a UV light source such as a metal halide lamp or a high-pressure mercury lamp, and can not only promote polymerization of low-power UV light, and The resulting optical compensation film has the advantage of less coloration. Further, as described above, when the bulkiness of the radical of the photopolymerization initiator is small, the adhesion between the optical anisotropic layer and the alignment film is improved. It is presumed that this is because the polymerizable radical of the optically anisotropic layer having a small bulkiness diffuses into the alignment film, and chemical bonds are formed on the surface of the alignment film, and hardening occurs in the vicinity of the alignment film to improve adhesion. Caused. Further, the photopolymerization initiator is preferably one which can be decomposed by energy of 100 mJ/cm ² by 30% or more.

Examples of the photopolymerization initiator which can be used in the first aspect of the present invention are described below, but are not limited thereto.

The amount of the photopolymerization initiator to be used is preferably from 0.01 to 20% by mass, more preferably from 0.5 to 5% by mass, based on the composition (solid content in the case of preparing a coating liquid). It is preferred to use ultraviolet rays for light irradiation of the molecular polymer of the liquid crystalline compound. The irradiation energy is preferably 20 mJ/cm ² to 50 J/cm ² , more preferably 100 to 800 mJ/cm ² . In order to promote the photopolymerization reaction, light irradiation may also be carried out under heating.

The thickness of the optically anisotropic layer formed is preferably from 0.1 to 10 μm, more preferably from 0.5 to 5 μm.

When the optically anisotropic layer is formed of a polymerizable composition containing a liquid crystal compound, it is preferable to achieve good adhesion between the optically anisotropic layer and the lower layer (alignment film or the like). It is such that the above composition contains a polyfunctional monomer. In the case where the aforementioned optically anisotropic layer is required to exhibit a high Rth, the film thickness of the layer is required to be relatively thick. When the film thickness of the optically anisotropic layer is thick, the adhesion to the alignment film tends to deteriorate. By having a polyfunctional monomer having two or more functional groups in the optically isotropic layer-forming composition described above, it is preferable because the adhesion can be improved.

A polyfunctional monomer having 2 or more polymerizable groups in the molecule, for example, may be an ester of a polyhydric alcohol and (meth)acrylic acid (for example, ethylene glycol di(meth)acrylate, butanediol Di(meth)acrylate, hexanediol di(meth)acrylate, 1,4-cyclohexanedi(meth)acrylate, pentaerythritol tetra(meth)acrylate], pentaerythritol tris(methyl) Acrylate, trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, two Pentaerythritol hexa(meth) acrylate, pentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexane tetramethacrylate, polyurethane acrylate, polyester polyacrylate] The above ethylene oxide modified product, vinylbenzene and derivatives thereof (for example, 1,4-divinylbenzene, 4-vinylbenzoic acid-2-propenylethyl ester, 1,4-divinyl) Cyclohexanone), vinyl hydrazine (for example, divinyl hydrazine), acrylamide (for example, methylenebis acrylamide) and methacrylamide. The above monomers may be used in combination of two or more kinds.

It is particularly preferred to use a polyfunctional monomer having 4 or more double bonds in the molecule. The double bond is preferably an ethylenic (aliphatic) unsaturated double bond. The number of intramolecular double bonds is preferably 4-20, more preferably 5-15, and most preferably 6-10. The polyfunctional monomer is preferably a polyol having 4 or more hydroxyl groups in the molecule, and an ester of an unsaturated fatty acid. Examples of unsaturated fatty acids include acrylic acid, methacrylic acid, maleic acid, and itaconic acid. More preferably, it is acrylic acid and methacrylic acid. The polyol having four or more hydroxyl groups in the molecule is preferably an alcohol having a tetravalent or higher alcohol or an oligomer having a trivalent or higher alcohol. The oligomer is a molecular structure having a linkage with a polyvalent alcohol by an ether bond, an ester bond or a urethane bond. More preferably, it is an oligomer having a molecular structure in which a polyvalent alcohol is bonded by an ether bond.

An ester of a polyol and a (meth)acrylic acid, which comprises pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, polyether polyol ( A poly(meth)acrylate of a methyl (meth)acrylate, a poly(meth)acrylate of a polyester-based polyol, and a polyurethane-based polyol. Commercial products of polyfunctional monomers can also be used. The monomer composed of the ester of polyol and acrylic acid is Mitsubishi Rayon Co., Ltd. (trade name: Da Ya Bim UK-4154), East Asia Synthetic Co., Ltd. (trade name: Aronicus M450), It is commercially available from Nippon Kayaku Co., Ltd. (trade name: KYARAD.DPHA, SR355). It is also possible to use two or more kinds of polyfunctional monomers in combination.

A polyfunctional monomer having 4 or more double bonds in the molecule and a monomer having 1 to 3 double bonds in the molecule may also be used in combination. The combination of monomers is effective for the adjustment between viscosity and strength. That is to say, as the number of double bonds in the monomer increases, the intermolecular interaction becomes large and the viscosity increases. When the viscosity is increased, the alignment of the molecules of the liquid crystalline compound takes time. On the other hand, in the case where the number of double bonds is large, the strength of the obtained optical compensation film becomes high. By using two or more types of monomers in combination, an appropriate viscosity and an appropriate strength can be easily achieved. The polyfunctional monomer having 4 or more double bonds in the molecule is preferably 20 to 80% by mass, more preferably 30 to 70% by mass based on the total amount of the monomers. A polyfunctional single system is added to the optically anisotropic layer together with liquid crystal molecules. The amount of the polyfunctional monomer to be added is preferably from 0.1 to 50% by mass, more preferably from 1 to 20% by mass, based on the liquid crystalline molecule.

The composition for forming an optically anisotropic layer may contain at least one of a liquid crystal compound and, if desired, a photopolymerization initiator, a polymerizable monomer, and other additives as described above. The aforementioned composition can also be prepared as a coating liquid. The solvent used in the preparation of the coating liquid is preferably an organic solvent. As the organic solvent, for example, (for example, N,N-dimethylformamide), anthracene (for example, dimethylhydrazine), a heterocyclic compound (for example, pyridine), or a hydrocarbon (for example, Benzene, hexane), alkyl halides (eg, chloroform, dichloromethane), esters (eg, methyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers (eg, Tetrahydrofuran, 1,2-dimethoxyethane). Among these, alkyl halides and ketones are preferred. Further, two or more organic solvents may be used in combination. A coating method can be widely applied by a known method (for example, an extrusion coating method, a direct gravure coating method, a repeated gravure coating method, or a die coating method).

It is preferred to use an alignment film in the formation of the aforementioned optically anisotropic layer. The alignment film has a function of aligning molecules of the liquid crystal compound in the above composition in a predetermined direction. The polymer layer and its surface rubbed polymer layer are typically used. Further, an alignment film which produces an alignment function by providing an electric field, providing a magnetic field or light irradiation is also known. The type of the polymer used for the alignment film can be determined in accordance with the alignment of the liquid crystal compound (especially the average tilt angle). For example, in order to horizontally align liquid crystallinity, a polymer (general alignment polymer) which does not lower the surface energy of the alignment film is used. Regarding the kind of the specific polymer, the matters described in the well-known literature on the liquid crystal cell or the optical compensation film can be widely used. In particular, when the liquid crystal compound is aligned in a direction perpendicular to the rubbing treatment direction, for example, it is preferred to use the modified polyvinyl alcohol described in JP-A-2002-62427. The acrylic copolymer described in the publication No. 2002-98836, and the polyimine and polylysine described in JP-A-2002-268068.

Further, in order to further improve the adhesion between the alignment film and the optically anisotropic layer, it is preferred to use a polymer having a polymerizable group as a polymer for use in formation of an alignment film. The polymerizable group may be introduced by introducing a repeating unit having a polymerizable group into a side chain or a substituent as a cyclic group. It is more preferable to use an alignment film in which a liquid crystal compound and a chemical bond are formed on the interface. For the alignment film, for example, the article described in JP-A-9-152509 can be used.

The thickness of the alignment film is preferably 0.01 to 5 μm, more preferably 0.05 to 2 μm. Further, after the molecules of the liquid crystal compound are aligned by using the alignment film, the molecules of the liquid crystal compound may be immobilized as they are in the alignment state to form an optically anisotropic layer, and only the optical anisotropic layer may be transferred. Printed on a polymer film.

<<Optical Anisotropic Layer Formed Using Polymer Material>> Further, the optically anisotropic layer may be a polymer layer formed by coating a polymer material. When a predetermined polymer material is used to prepare a coating liquid containing the same and applied to a surface of a polymer film or the like, the polymer is surface-aligned to exhibit a negative refractive index anisotropy and formed on the normal side of the film surface. An optically anisotropic layer having an optical axis in the direction. Specific examples of the polymer having such a property include a polymer material (polyamide, polyimine, polyamine) having at least one aromatic ring described in JP-A-2000-190385. Various polymers such as acid, polyester or polyester decylamine). In addition, in the process of forming the optically anisotropic layer by coating and drying, a polymerizable low molecular compound capable of providing such a polymer can be used to form a polymer.

The optical compensation film according to the first aspect of the present invention may be incorporated in a liquid crystal display device as described above, or may be integrated with a polarizing film to form a polarizing plate as described below. It is incorporated in a liquid crystal display device.

. Second aspect

Further, in the second aspect of the present invention, the in-plane hysteresis Re of the wavelength λ nm of the predetermined member X and the hysteresis Rth in the thickness direction are expressed as "Re _λ (x)" and "Rth _λ (X). "."

[Optical Compensation Film of Second Aspect] The second aspect of the present invention relates to an optical compensation film C of a C plate. The optical compensation film C of the second aspect of the present invention is preferably a negative C plate. Re ₅₅₀ (C) is preferably 0~10 nm, more preferably 0~5 nm, more ideally 0~3 nm. Moreover, the Rth ₅₅₀ (C) is preferably 100 nm or more, more preferably 120 to 280 nm, and more preferably 160 to 220 nm.

The optical compensation film C according to the second aspect of the present invention has a transparent support C1 and an optically anisotropic layer C2 supported by the transparent support C1. The transparent support C1 and the optically anisotropic layer C2 described above satisfy the following formulas (2-1) to (2-3), respectively.

(2-1) 0≦Re ₆₃₀ (C1)≦10 (2-2)0≦Re ₅₅₀ (C2)≦10 (2-3)100≦Rth ₅₅₀ (C2)-Rth ₅₅₀ (C1)

Since the transparent support C1 and the optically anisotropic layer C2 satisfy the above formulas (2-1) and (2-2), respectively, they do not substantially have an optical axis in the plane. On the other hand, since the transparent support C1 and the optically anisotropic layer C2 satisfy the above relationship (2-3), at least one of the optically isotropic layer C2 and the transparent support C1 is A positive or negative C plate holding the optical axis in the thickness direction. The optically anisotropic layer C2 and/or the transparent support C1 is preferably a negative C plate, and is preferably a C plate in which both the optically anisotropic layer C2 and the transparent support C1 are negative.

Furthermore, the optical compensation film C of the second aspect of the present invention satisfies the following formula (2-4).

(2-4)| Rth ₄₅₀ (C2)/Rth ₅₅₀ (C2)-Rth ₄₅₀ (C)/Rth ₅₅₀ (C)|≦0.1

The ratio of Rth at a wavelength of 450 nm and 550 nm (Rth ₄₅₀ /Rth ₅₅₀ ) is an index of the wavelength dispersion of the member. The Rth ₄₅₀ /Rth ₅₅₀ system of the component of the dispersibility exceeds 1, and the Rth ₄₅₀ /Rth ₅₅₀ of the member of the reverse dispersion is less than 1. Since the optical compensation film C and the optically anisotropic layer C2 of the second aspect of the present invention satisfy the above formula (2-4), the wavelength dispersion of the optical compensation film C is almost equal to the optical anisotropic layer C2. Wavelength dispersion.

In the aspect of the C plate in which the transparent support C1 and the optically anisotropic layer C2 are substantially only in the thickness direction, the Rth of the optical compensation film C of the laminate can be approximated by the sum of both Rths. Similarly, the wavelength dispersion of Rth of the optical compensation film C (Rth ₄₅₀ /Rth ₅₅₀ ) is also a wavelength dispersion which can be approximated by the sum of Rths at both wavelengths, which is equal to the wavelengths of C1 and C2. The average value of the load from the Rth ₅₅₀ of the sign of the dispersion (Rth ₄₅₀ /Rth ₅₅₀ ). That is, the contribution rates of C1 and C2 are determined by the value of individual Rth.

In the case where the absolute value of the Rth of the transparent support C1 is sufficiently small, the Rth of the optical compensation film C becomes almost equal to the optical difference by using the optically anisotropic layer C2 satisfying the above formula (2-3). Rth of the directional layer C2. Therefore, in this aspect, the wavelength dispersion of the Rth of the optical compensation film C becomes a wavelength dispersion which is almost similar to the optical anisotropic layer C2 which accounts for more than half of the contribution of Rth.

A negative C plate showing a high Rth value, for example, can be produced by transferring a polymerizable liquid crystal composition into a predetermined liquid crystal phase and fixing the state. Further, it can be produced by coating and drying a coating liquid containing a predetermined polymer such as polyimine. The optically anisotropic layer produced by such a method becomes a negative C plate exhibiting a high Rth value, and the wavelength dispersion of Rth exhibiting such an optically anisotropic layer is cis-dispersibility. In the second aspect of the present invention, the Rth of the optical compensation film and its contribution to the wavelength dispersibility are particularly large in comparison with the transparent support C1 due to the optical anisotropic layer C2. Therefore, a high Rth is exhibited, and a high Rth is exhibited by using the C plate in which the wavelength dispersion of Rth is dispersive as the optically anisotropic layer C2, and the wavelength dispersion of the Rth can be easily obtained. For the smooth dispersion of the C board.

As described above, in the second aspect of the present invention, it is difficult to produce a C plate having a high Rth value and exhibiting a wavelength dispersion of the Rth as a dispersibility by using only a polymer film used as a transparent support. In order to solve this problem, the optical compensation film is formed into a laminate of a transparent support C1 composed of a polymer film and an optically anisotropic layer C2, so that Rth can be obtained than that of the transparent support C1. The Rth value of the high Rth value and the wavelength dispersibility of the Rth are further increased as the Rth of the optically anisotropic layer C2 of the optical property of the dispersion is further increased. The optical compensation film according to the second aspect of the present invention is used in a liquid crystal display device, and particularly when used for optical compensation of a liquid crystal display device of a VA mode, color change and light generated with a viewing angle in black display can be reduced. leak. Further, in the second aspect of the present invention, since the contribution of the wavelength dispersibility of Rth of the transparent support C1 is small, for example, even if Rth is used as the deuterated cellulose which exhibits a tendency to reverse dispersion, It is also possible to provide an optical compensation film in which the wavelength dispersion of Rth is a display of dispersibility.

Hereinafter, a better range of the optical characteristics of each member and a material used for production will be described in detail.

[Optical Characteristics of Transparent Support C1 and Optically Isotropic Layer C2] The in-plane retardation Re of the transparent support C1 is preferably 0 to 10 nm, more preferably 0 to 5 nm, and more preferably 0 to 3 N. Meter. Further, the retardation Rth in the thickness direction is preferably -25 to 100 nm, more preferably -25 to 50 nm, and more preferably -25 to 25 nm. The in-plane retardation Re of the optically isotropic layer C2 is preferably 0 to 10 nm, more preferably 0 to 5 nm, and more preferably 0 to 3 nm. Further, the retardation Rth in the thickness direction is preferably 100 to 300 nm, more preferably 120 to 240 nm, and more preferably 150 to 210 nm. In the second aspect of the present invention, it is preferable that both of the transparent support C1 and the optically anisotropic layer C2 are negative C plates.

Further, the wavelength dispersibility of Rth of the transparent support C1 may be either a cis-dispersibility or a reverse dispersion property. However, in the case of reverse dispersion, it is preferable that the degree of wavelength dispersibility is small. By. Specifically, Rth ₄₀₀ (C1)-Rth ₇₀₀ (C1) is preferably -35 to 50, more preferably -25 to 25. On the other hand, the wavelength dispersibility of the Rth of the optically anisotropic layer C2 is almost equal to the wavelength dispersion of the optical compensation film C, so that its preferable properties will follow the use of the optical compensation film (becoming an optical compensation film). The mode of the liquid crystal display device of the object is different, but generally it is preferably a disperser. For the optical compensation of the VA mode liquid crystal display device, Rth ₄₅₀ (C2)/Rth ₅₅₀ (C2 ) is preferably 1.04~1.30, more preferably 1.10~1.25.

[Transparent Support C1] In the second aspect of the present invention, the transparent support C1 is preferably made of a polymer film. The material is not particularly limited as long as the optical characteristics required for the transparent support C1 are satisfied. For example, when the optical compensation film of the second aspect of the present invention is bonded to the polarizing film to perform polarizing plate processing, the polarizing plate is processed. Next, it is also necessary to have a function as a protective film for protecting the polarizing film. In this aspect, it is preferred to use a deuterated cellulose film, a cycloolefin polymer, and a lowering. The olefin polymer and the lactone ring contain a polymer resin film or polycarbonate.

In the second aspect of the present invention, as described above, since it is desired to obtain a transparent support having a sufficiently slanted dispersion, it is preferable to select a polymer film having a small absolute value of Rth as a transparent film. The support C1 suppresses the contribution to the Rth of the optical compensation film C as small as possible. The C plate having a small Rth value is, for example, the deuterated cellulose-based film described in the column of 0043 to 0250 of JP-A-2006-30937, and JP-A-2002-22954. In the lactone-based film, the lactone ring described in the manual of WO 2006-112207, which has been developed in recent years, contains a polymer film such as a polymer resin film.

Among these, from the viewpoint of processing suitability of the polarizing plate, it is preferable to use a cellulose-based film, and the polymer resin film of the lactone ring has a low photoelastic coefficient, especially as a C plate. When the transparent support C1 is used, it is difficult to find excess in-plane retardation, which is preferable.

[Optical Anisotropic Layer C2] The optically anisotropic layer C2 is preferably a C plate having a high Rth (at least an Rth value higher than the transparent support C1). The material is not particularly limited as long as it satisfies the optical characteristics required for the optically anisotropic layer C2, and may be an optically anisotropic layer composed of a polymerizable liquid crystal composition, or may be composed of a polymer. Optically anisotropic layer. The optically anisotropic layer of the C plate having a high Rth and a wavelength dispersibility of Rth which is negative in dispersibility can be easily formed by using a polymerizable liquid crystal composition.

A method of forming an optically anisotropic layer of a negative C plate by a liquid crystal composition, preferably coating a liquid crystal composition containing a rod-like liquid crystal compound on a surface of the transparent support to direct molecular orientation of the rod-like liquid crystal compound a method in which the direction of the director is substantially parallel to the layer and is formed as a cholesterol (cholesteric phase), and is fixed by polymerization or the like in this state; and a molecule containing a cholesteric liquid crystal compound is coated on the surface of the transparent support. The liquid crystal composition is such that the molecules of the cholesteric liquid crystal compound are aligned vertically, and the direction in which the molecules are directed is substantially perpendicular to the alignment of the layers to form a nematic phase, which is formed by post-fixation by polymerization or the like in the alignment state. Methods.

The [rod-like liquid crystalline compound] can be used for the rod-like liquid crystalline compound formed on the optically anisotropic layer C2, and is preferably an azomethylene group, an azogen group, a cyanide or a cyanobenzene. Base esters, benzoates, phenyl cyclohexane carboxylates, cyanophenyl cyclohexanes, cyano substituted phenyl pyrimidines, alkoxy substituted phenyl pyrimidines, phenyl dioxane Classes, tolane and alkenylcyclohexylbenzonitriles. The polymer liquid crystal compound may be used not only for the low molecular liquid crystalline compound as described above. As the rod-like liquid crystal compound capable of being fixed by polymerization, it is suitable to use a structure having a partial structure which can cause polymerization and crosslinking reaction by active light, electron beam, heat or the like. The number of structures in this part is preferably 1 to 6, more preferably 1 to 3. Polymeric rod-like liquid crystalline compounds, which can be used in Macromolecular Chemistry, Vol. 190, p. 2255 (1989); Advanced Materials, Vol. 5, p. 107 (1993); U.S. Patent No. 4,683,327, U.S. Patent No. 5,622,648, U.S. Patent No. 5,770,107, International Publication No. WO 95/22586, International Publication No. WO 95/24455, International Publication No. WO 97/00600, International Publication No. WO 98/23580, Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The compounds described in, for example, JP-A-2002-30042, JP-A-2005-99237, JP-A-2005-129827, JP-A-2002-30042, and the like.

Among the rod-like liquid crystal compounds, as described above, it is preferably a liquid crystal compound which can be transferred into a cholesterol phase, and specifically, it is preferably used in the 0077 column to the 0081 of JP-A-2004-110003. Polymeric liquid crystal compound and polymerizable optical activity (chiral) agent described in the column

[Disc liquid crystal compound] A discotic liquid crystal compound which can be used for the formation of the optically anisotropic layer C2 includes a study by C. Destrade et al. (Mol. Cryst., Vol. 71, p. 111 (1981) Benzene derivatives, as described in C. Destrade et al., Mol. Cryst., Vol. 122, p. 141 (1985), Physics lett, A, vol. 78, p. 82 (1990 Toluene derivative described in the above)); cyclohexane derivative described by B. Kohn et al. in the research report (Angew. Chem., vol. 96, p. 70 (1984)) And JMLehn et al. in the research report (J. Chem. Commun., p. 1794 (1985)), J. Zhang et al. in the research report (J. Am. Chem. Soc., 116, 2655) Aza-coronary system and phenylacetylene macrocycle described in the page (1994).

As the discotic liquid crystal compound, the structure of the side chain of the linear core, the alkoxy group or the substituted benzamidineoxy group which is substituted into a radial form as a mother nucleus is also included for the core of the molecular center. Compound. The aggregate of molecules or molecules is preferably a compound having rotational symmetry and capable of imparting a certain alignment. A preferred example of the discotic liquid crystal compound is described in JP-A-8-50206. Further, the polymerization of the discotic liquid crystalline compound is described in JP-A-8-27284.

In addition, the same is true for the rod-like liquid crystal compound. However, the optically anisotropic layer formed of the liquid crystalline composition containing the discotic liquid crystalline compound does not have to be a liquid crystalline compound in the optically isotropic layer. For example, when a low-molecular liquid crystal compound has a group which reacts with heat or light, as a result, it is polymerized or crosslinked by heat or photoreaction, and the polymer compound loses liquid crystallinity.

[Fluorine-based polymer] In the process of producing the optically anisotropic layer C2, the direction in which the molecules of the rod-like liquid crystalline compound are directed is qualitatively parallel (Re is substantially 0 nm) on the layer, or When the molecules of the discotic liquid crystal compound are horizontally aligned, that is, the direction in which the discotic molecules are directed is substantially perpendicular (Re is substantially 0 nm) on the layer, it is preferable to have the general formula (a) The fluorine-based polymer of the repeating unit (hereinafter, referred to as "polymer A" in some cases), that is, the liquid crystalline composition used for the formation of the optically anisotropic layer C2 is preferably used. At least one of the polymers A is contained.

The definition of the general formula (a), its preferred examples, and the like are the same as those described in the first aspect above.

In the following, a specific example of the polymer A which is suitably used in the second aspect of the present invention is exemplified, but the second aspect of the present invention is not limited to the specific examples. The numerical values (a, b, c, d, etc.) in the formula are the mass percentages of the composition ratios of the respective monomers, and Mw is obtained by using TSK Gel GMHxL, TSK Gel G4000 HxL, TSK Gel G2000 HxL ( Any one of the GPC analyzers of the column of the product name of the company, the solvent of THF, and the mass average molecular weight expressed by polystyrene measured by the differential refractometer.

[Polyfunctional monomer] In order to improve the adhesion between the optically anisotropic layer C2 and the transparent support C1, it is preferred to use a liquid crystal composition for forming the optically anisotropic layer C2. It contains a polyfunctional monomer. The film thickness of the optically anisotropic layer C2 differs depending on the hysteresis of the object. However, in order to exhibit a certain degree of Rth value, it is preferably 0.5 μm or more. When a layer of 0.5 μm or more is formed of a polymerizable liquid crystal composition, the adhesion to the transparent support C1 may be remarkably lowered. When the polyfunctional monomer having two or more functional groups is contained in the liquid crystal composition, the adhesion between the optically anisotropic layer C2 and the transparent support C1 can be improved, which is preferable.

The polyfunctional single system which can be used in the second aspect of the present invention is the same as the polyfunctional monomer which can be used in the above first aspect.

The optically anisotropic layer C2 can prepare a polymerizable liquid crystal composition into a coating liquid, apply the coating liquid to the transparent support C1, dry it, and transfer it to a desired liquid crystal phase, and then, in the alignment state, The polymerization is fixed to form. The conditions which can be used for the preparation of the coating liquid, the polymerization initiator which can be added to the polymerizable liquid crystal composition, and the intensity of the UV light to be irradiated during polymerization can be referred to various materials and methods known in the art. The conditions and the like (for example, the materials and conditions described in JP-A-2005-173567, etc.) can be referred to. Further, in the formation of the optically anisotropic layer C2, an alignment film can be used to transfer the cholesterol phase and an alignment film which can be used in a vertical alignment direction. For example, it may be The alignment film described in the column of No. 0156 of JP-A-2005-49866.

[Polymer for Optically Isotropic Layer C2] The optically anisotropic layer C2 serving as a C plate can also be formed by a polymer composition. For example, when the polymer composition is formed into a film-like material and the predetermined optical characteristics required for the optically anisotropic layer C2 are exhibited, the optically anisotropic layer C2 can be used as it is. Moreover, in order to satisfy predetermined optical characteristics, the stretched film subjected to the stretching treatment or the object produced by the alignment film may be suitably used as the optically anisotropic layer C2. Further, after the layer is laminated with the transparent support C1, the stretching treatment may be performed.

The polymer used for the formation of the optically anisotropic layer C2 is preferably an acetate resin, a polyester resin, a polyether oxime resin, a polyfluorene resin, a polycarbonate resin, a polyamide resin, or a polyimide resin. , polyolefin resin, acrylic resin, drop Alkene resin, cellulose resin, polyacrylate resin, polystyrene resin, polyvinyl alcohol resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyacrylic resin, mixed resin of these, liquid crystal polymer, and a group of a thermoplastic resin having a substituted quinone imine group or an unsubstituted quinone group on the side chain and a thermoplastic resin having a substituted phenyl group or an unsubstituted phenyl group and a nitrile group in the side chain. At least one selected polymer. Among these, it is more preferred to use polycarbonate, cycloolefinene polymers and a stretched film selected from the group consisting of an olefinic polymer or a fluoridated cellulose film, or from polyamine, polyimine, polyester, polyether ketone, polyamidimide, and polyester quinone At least one of the selected alignment films as a material.

. Third aspect

Hereinafter, an optical compensation film according to a third aspect of the present invention will be described in detail.

[Optical Compensation Film of Third Aspect] The optical compensation film of the third aspect of the present invention has substantially no in-plane retardation, has a negative refractive index anisotropy, and has an optical axis in the normal direction.

The in-plane retardation of the optical compensation film according to the third aspect of the present invention is 0 to 10 nm, preferably 0 to 5 nm, and particularly preferably 0 to 3 nm. The hysteresis in the thickness direction is 100 to 300 nm, more preferably 120 to 270 nm, and particularly preferably 150 to 240 nm.

In addition, the wavelength dispersion Rth(450)/Rth(550) of the optical compensation film is preferably 1.03 or more, more preferably 1.06 or more, still more preferably 1.09 or more, and particularly preferably 1.12 or more (here, Rth( 450) indicates a Re value at 450 nm, and Rth (550) indicates a Re value at 550 nm). When a condition like this is satisfied, the liquid crystal display element can be compensated for covering the entire visible light region.

[Optical anisotropic layer] The retardation Rth in the thickness direction of the optically anisotropic layer in the optical compensation film of the third aspect of the present invention divided by the film thickness of the optically isotropic layer Rth/d is preferably 0.065~ 0.160, preferably more than 0.075, more preferably 0.085 or more. Further, it is preferably 0.15 or less, more preferably 0.14 or less. The in-plane hysteresis Re should be 0~10 nm, preferably 0~5 nm. Such an optically anisotropic layer is advantageous in that unevenness is less likely to occur when it is continuously applied to a long support.

In addition, the wavelength dispersibility Rth(450)/Rth(550) of the optically anisotropic layer is preferably 1.06 or more, more preferably 1.09 or more, more preferably 1.12 or more, and particularly preferably 1.15 or more (here, Rth (450) indicates a Re value at 450 nm, and Rth (550) indicates a Re value at 550 nm). When such a condition is satisfied, the aforementioned wavelength dispersion characteristics as an optical compensation film can be exhibited, and the liquid crystal display element can be compensated for covering the entire visible light region.

[Optical Anisotropic Layer Made of Liquid Crystalline Compound] The optical compensation film of the third aspect of the present invention is formed by laminating an optically anisotropic layer on a polymer film substrate. The optically anisotropic layer is preferably formed of a polymerizable composition, and is preferably formed of a composition including a liquid crystalline compound having an optically negative refractive index anisotropy and a polymerizable group. The optically anisotropic layer may be, for example, a layer formed of a polymerizable composition containing an optically active nematic (cholesteric) liquid crystalline compound, or a composition containing a liquid crystalline compound. The dish-formed unit derived from the discotic liquid crystal compound is formed to be horizontally aligned with respect to the polymer film.

The optically active nematic (cholesteric) liquid crystal compound means a compound containing a compound of the compound which forms an optically active nematic (cholesteric) liquid crystal phase when applied to a polymer substrate. As a compound such as this, for example, it is a rod-like liquid crystal compound or a polymer liquid crystal compound.

In order to align the rod-like liquid crystalline compound into an optically active nematic (cholesteric type), an optically active rod-like liquid crystalline compound or a mixture of a rod-like liquid crystalline compound and an optically active compound may be used. The rod-like liquid crystalline compound is preferably an azomethylene group, an azogen group, a cyanide, a cyanophenyl ester, a benzoate, a phenylcyclohexanecarboxylate or a cyanophenyl ring. Hexanes, cyano substituted phenylpyrimidines, alkoxy substituted phenylpyrimidines, phenyldioxanes, diphenylacetylenes and alkenylcyclohexylbenzonitriles.

The composition containing the compound can be applied to a polymer film substrate, and can be fixed by maintaining the alignment state in the same manner as the method of forming an optically anisotropic layer from a discotic liquid crystal compound to be described later.

Further, the optically anisotropic layer may be formed by using a polymer material having a negative refractive index anisotropy and having an optical axis in the normal direction of the film surface when the coating is applied. Such a polymer material is a film-forming material (polyamide, polyimine, poly-proline, etc.) having at least one type of aromatic ring as disclosed in JP-A-2000-190385. Various polymers such as polyester or polyester decylamine, or polymerizable low molecular compounds capable of providing such polymers, etc., which have a negative refractive index anisotropy at the time of coating, and a method on the surface There is an optical axis in the line direction and usually has a hysteresis of positive wavelength dispersion.

[Optical anisotropic layer composed of a discotic liquid crystalline compound] In the third aspect of the invention, the optically anisotropic layer is preferably formed of a composition containing a discotic liquid crystalline compound.

The dish-like liquid crystal compound can be widely used in various literatures (C. Destrade et al., Molecular Liquid Crystals, Vol. 71, p. 111 (1981); Japanese Chemical Society, Quarterly Chemistry, Volume 22, Liquid Crystal Chemistry , Chapter 5, Chapter 10, Section 2 (1994); B. Kohn et al., Angew. Chemical Association, Chemical Communication, pp. 1794 (1985); J. Zhang et al., Journal of the American Chemical Society, Book 116, Article 2655 (1994)). For the polymerization of the discotic liquid crystalline compound, for example, the method described in JP-A-8-27284 can be employed.

The discotic liquid crystalline compound preferably has a polymerizable group which can be fixed by polymerization. For example, a structure in which a polymerizable group as a substituent is bonded to a disk-shaped core of a discotic liquid crystalline compound can be considered. Moreover, it is more preferable that the disk-shaped core and the polymerizable group have a linking group. When a structure having a linking group is employed, it becomes easier to maintain the alignment state in the polymerization reaction. The discotic liquid crystalline compound having a polymerizable group is preferably a compound represented by the following general formula (VI).

General formula (VI) D (-L-P)n (in general formula (VI), D is a disc-shaped core, L is a divalent linking group, P is a polymerizable group, and n is an integer of 4 to 12 ).

The disc-shaped core (D), the divalent linking group (L), and the polymerizable group (P) in the above formula (VI), for example, may be exemplified in JP-A-2001-4837, respectively. (D1)~(D15), (L1)~(L25), (P1)~(P18) are described.

In the case of a discotic liquid crystalline compound having a polymerizable group, it is substantially horizontally aligned as described above. Specific examples of the discotic liquid crystalline compound in this case are, for example, more preferably described on page 58 of the International Publication No. WO 01/88574A1, line 6 to page 65, line 8. Things.

In the optical compensation film according to the third aspect of the present invention, the refractive index anisotropy of the optically anisotropic layer is preferably high; and the dish-like liquid crystal compound capable of providing a high refractive index anisotropic layer can be suitably used. The compound exemplified in JP-A-2001-166147 [0050] to [0142] is used. Among these, it is preferably a compound represented by the general formula [1010] in [0050] of the publication, and particularly preferably a compound represented by the discotic liquid crystal compound (II) in the following [Example]. .

[Horizontal alignment agent] The composition for forming the optically anisotropic layer is preferably a "horizontal alignment agent" in addition to the discotic liquid crystalline compound. By including at least one "horizontal alignment agent" in the composition, the dish-shaped structural unit in the formed optically anisotropic layer can be aligned substantially horizontally with respect to the polymer film. In addition, the "horizontal alignment" in the present specification does not require that the long-axis direction of the disk-shaped liquid crystalline compound (that is, the disk surface of the core) be strictly parallel to the horizontal plane of the liquid crystal layer (for example, the liquid crystal layer is formed on the support body). In the above case, it is the surface of the support. In the present specification, the angle between the disk of the core and the horizontal plane is less than 10 degrees. The inclination angle is preferably 5 degrees or less, more preferably 3 degrees or less, more preferably 2 degrees or less, and most preferably 1 degree or less. The aforementioned tilt angle can also be 0 degrees.

The above-mentioned horizontal alignment agent may be suitably used in the compound exemplified in JP-A-2005-128050 [0049] to [0082] or a fluoroaliphatic-containing polymer, but in the third aspect of the present invention, It is preferred to use a fluoroaliphatic-containing polymer, and among the fluoroaliphatic-containing polymers, a copolymer of a fluoroaliphatic-containing monomer and the following general formula (a) is particularly preferred.

[The fluoroaliphatic-containing monomer and the copolymer of the general formula (a)] are used to form the composition of the optically anisotropic layer described above, in order to make the direction in which the rod-like liquid crystalline compounds are directed substantially parallel (Re essentially (0 nm) on the substrate, or in order to make the disc-like liquid crystalline compound horizontally aligned, that is, the direction of the pointing is substantially perpendicular (Re is substantially 0 nm) on the substrate, preferably containing the following general formula ( a) The fluorinated aliphatic group-containing polymer represented by the repeating unit (hereinafter, referred to as "polymer A" in some cases).

The definition of the general formula (a), its preferred examples, and the like are the same as those of the first aspect described above.

In the third aspect of the present invention, the amount of the above-mentioned "horizontal alignment agent" is preferably 0.01 to 20% by mass, more preferably 0.05 to 10% by mass, particularly preferably 0.1% by mass of the liquid crystalline compound. ~5 mass%. In addition, the above-mentioned "horizontal alignment agent" may be used alone or in combination of two or more.

[Immobilization of the alignment state of the liquid crystal compound] When the optically anisotropic layer is formed of a composition containing a liquid crystal compound, it is preferred to fix the aligned liquid crystal compound in an aligned state. The immobilization is preferably carried out by a polymerization reaction of a polymerizable group introduced into the liquid crystal compound. The polymerization reaction is a photopolymerization reaction including a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization initiator, and more preferably a photopolymerization initiator.

[Photopolymerization initiator] The photopolymerization initiator may, for example, be an α-carbonyl compound (the one described in each specification of U.S. Patent No. 2,376,661, U.S. Patent No. 2,367,670), and an Etherether (in U.S. Patent) An article described in the specification of No. 2448828, an α-hydrocarbon-substituted aromatic aryl compound (the one described in the specification of U.S. Patent No. 2,722,512), a polynuclear quinoline compound (in U.S. Patent No. 3,046,127, U.S. a combination of a triaryl imidazole dimer and a p-aminobenzophenone (as described in the specification of U.S. Patent No. 3,549,367), acridine and a phenanthridine compound (the one described in the specification of Japanese Patent No. 4,239,850, and the disclosure of the specification) An oxadiazole compound (as described in the specification of U.S. Patent No. 4,212,970).

The optical compensation film according to the third aspect of the present invention is preferably produced by adding or subtracting the amount of ultraviolet light. However, in this case, a portion where light cannot be obtained in the thickness direction of the optically anisotropic layer may not be obtained. The polymerization for forming the optically anisotropic layer is performed uniformly. Therefore, in order to maintain uniform polymerizability in the thickness direction, the photopolymerization initiator is preferably one in which light absorption is in a long wavelength region and the diffusivity of the generated radical is high; more specifically, it is preferably A hydrocarbon radical having a photoreceptor range of from 330 nm to 450 nm and having a halogen radical or a number of atoms other than a hydrogen atom of 8 or less is used as a polymerization starting radical. The halogen radical, for example, may be a radical of fluorine, chlorine, bromine or iodine, but particularly preferably a chlorine radical. The hydrocarbon radical having 8 or less atoms other than the hydrogen atom may be a hydrocarbon radical having a substituent such as a halogenated hydrocarbon radical, and examples thereof are, for example, a methyl radical, an ethyl radical, A propyl radical, a butyl radical, a phenyl radical, a tolyl radical, a chlorophenyl radical, a bromophenyl radical, a benzinyl radical, or the like. The matching of the photosensitive wavelength and the light source is an essential requirement for high sensitivity. The photopolymerization initiator having a photoreceptor region of 330 nm to 450 nm has an advantage of not only matching well with a UV light source such as a metal halide lamp or a high-pressure mercury lamp, but also promoting polymerization of low-power UV light, and The optical compensation film has the advantage of less coloring. Further, as described above, when the bulk density of the radical of the photopolymerization initiator is small, the adhesion between the optical anisotropic layer and the alignment film becomes good. This is presumably because the polymerizable radical of the optically anisotropic layer having a small bulk density diffuses into the alignment film, so that a chemical bond is generated on the surface of the alignment film, and hardening occurs in the vicinity of the surface of the alignment film to improve the adhesion.

Further, the photopolymerization initiator is preferably one which is decomposed by energy of 100 mJ/cm ² by 30% or more. The photopolymerization initiator is an example of the photopolymerization initiator, and the photopolymerization initiator which can be used in the third aspect of the invention is not limited thereto.

The amount of the photopolymerization initiator to be used is preferably from 0.01 to 20% by mass, more preferably from 0.5 to 5% by mass, based on the solid content of the coating liquid. It is preferred to use ultraviolet rays for light irradiation for polymerization of a liquid crystal compound. The irradiation energy is preferably 50 mJ/cm ² to 800 mJ/cm ² , more preferably 100 to 500 mJ/cm ² . In order to promote photopolymerization, light irradiation can also be carried out under heating. The thickness of the optically anisotropic layer is preferably 0.1 to 10 μm, more preferably 0.5 to 5 μm.

[Polyfunctional monomer] The composition containing the liquid crystalline compound for forming an optically anisotropic layer is preferably a polyfunctional monomer which is intended to have good adhesion to an alignment film to be described later. In the case where the optically anisotropic layer is formed with a lower amount of ultraviolet light than the normal one, the adhesion between the support which is the lower layer of the optically isotropic layer and the optically anisotropic layer is reduced, but When the optically anisotropic layer contains a polyfunctional monomer having two or more functional groups, the adhesion which is easily deteriorated can be improved.

The polyfunctional monomer which can be used is the same as the polyfunctional monomer which can be used in the above first aspect.

When the optically anisotropic layer is formed of a composition containing a liquid crystalline compound, it is preferred to form the composition on the alignment film by using the composition as a coating liquid. The solvent used for the preparation of the coating liquid is preferably an organic solvent. As the organic solvent, for example, guanamine (for example, N,N-dimethylformamide), anthraquinone (for example, dimethyl hydrazine), a heterocyclic compound (for example, pyridine), or a hydrocarbon ( For example, benzene, hexane), alkyl halides (eg, chloroform, dichloromethane), esters (eg, methyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers ( For example, tetrahydrofuran, 1,2-dimethoxyethane). Among these, alkyl halides and ketones are preferred. Further, two or more types of organic solvents may be used in combination. A coating method can be widely applied by a known method (for example, an extrusion coating method, a direct gravure coating method, a repeated gravure coating method, or a die coating method).

[Alignment film] In order to align the liquid crystal compound, an alignment film is preferably used. Further, an alignment film which generates an alignment function by providing an electric field, imparting a magnetic field or light irradiation is also known. The type of polymer used in the alignment film can be determined in accordance with the alignment of the liquid crystal compound (especially the average tilt angle). For example, in order to horizontally align the liquid crystalline compound, a polymer (general alignment polymer) which does not lower the surface energy of the alignment film is used. Regarding the kind of the specific polymer, the matters described in the well-known literature on the liquid crystal cell or the optical compensation film can be widely used. In particular, when the liquid crystal compound is aligned in a direction perpendicular to the rubbing treatment direction, for example, it is preferred to use the modified polyvinyl alcohol described in JP-A-2002-62427. The acrylic copolymer described in the publication No. 2002-98836, and the polyimine and polylysine described in JP-A-2002-268068. Among any alignment films, in order to achieve better adhesion between the liquid crystalline compound and the polymer film substrate, it is preferred to have a polymerizable group. The polymerizable group may be introduced by introducing a repeating unit having a polymerizable group into a side chain or a substituent as a cyclic group. It is more preferable to use an alignment film in which a liquid crystal compound and a chemical bond are formed on the interface. For the alignment film, for example, the article described in JP-A-9-152509 can be used.

The thickness of the alignment film is preferably 0.01 to 5 μm, more preferably 0.05 to 2 μm. Further, after the molecules of the liquid crystal compound are aligned by using the alignment film, the molecules of the liquid crystal compound may be immobilized as they are in the alignment state to form an optically anisotropic layer, and only the optical anisotropic layer may be transferred. Printed on a polymer film.

[Polymer Film Substrate] As the polymer film substrate in the third aspect of the present invention, for example, it may be a drop An olefin-based polymer film, a polycarbonate-based polymer film, a polyester-based polymer film, an aromatic polymer film such as a polyfluorene-based film, a bismuth cellulose film, etc., but in the case of using a cellulose-deposited film It is particularly preferable to use the optical compensation film as a polarizing plate protective film for ease of use. Such a polymer film can be produced by a suitable method such as extrusion molding or cast film formation.

Further, in the polymer film substrate of the third aspect of the present invention, a stretched film such as a biaxially stretched film may be used. The stretched film can be formed, for example, by stretching the above-prepared unstretched film by a roll longitudinal stretching method, a tenter transverse stretching method, a biaxial stretching method, or the like. The stretching temperature is preferably in the vicinity of, or in the middle of, the glass transition temperature (Tg) of the film to be treated, and is less than Tg to less than the melting point.

As described in the foregoing, in order to obtain good display characteristics, the wavelength-dispersibility Rth(450)/Rth(550) of the hysteresis in the thickness direction of the optical compensation film according to the third aspect of the present invention is preferably higher. On the other hand, the wavelength dispersibility of a general polymer film is lower than that of an optically anisotropic layer formed of a liquid crystalline compound, and among the optical compensation films having a certain Rth, a laminated polymer film and optical anisotropy are used. The wavelength dispersion of the entire optical compensation film formed by the layer is lower as the Rth of the polymer film is higher. Therefore, it is preferred that the Rth of the polymer film is small.

The Rth of the polymer film substrate used in the present invention is preferably -40 to 100 nm, more preferably -30 to 50 nm, more preferably -25 to 25 nm, and particularly preferably -10 to 10 Nano.

The thickness of the polymer film substrate can be appropriately determined by a phase difference or the like. However, in general, from the viewpoint of thinning, it is preferably 10 to 200 μm, more preferably 20 to 150 μm, and particularly preferably 30~100 microns.

The optical compensation films of the first, second, and third aspects of the present invention (hereinafter, collectively referred to as "the optical compensation film of the present invention") can be used for various purposes, and particularly, liquid crystal display for use in the VA mode. Optical compensation film for the device.

The optical compensation film of the present invention can be bonded to a linear polarizing film (hereinafter, simply referred to as "linear polarizing film" in the case of "polarizing film"), and can be used as a circular polarizing plate or a circular polarizing plate. use. In this aspect, the polymer film of the support of the optically anisotropic layer is preferably capable of obtaining a protective film as a polarizing film; from this point of view, the cellulose film is preferably deuterated. .

Hereinafter, the polarizing plate of the present invention obtained by adding the optical compensation film of the present invention will be described in detail.

[Polarizing Plate] The polarizing plate of the present invention has at least the optical compensation film of the present invention and a polarizing film.

The polarizing film described above is not particularly limited, and a known one can be widely used. For example, it can be used in polyvinyl alcohol and partially formaldehydeized polyvinyl alcohol, ethylene. a film composed of a hydrophilic polymer such as a partially saponified product of a vinyl acetate copolymer, which is adsorbed by iodine and/or azo and lanthanum, and A material which is a dichroic substance such as a dichroic dye and is subjected to a stretch alignment treatment. In the present invention, it is preferable to use the stretching method described in JP-A-2002-131548. In particular, it is particularly preferable that the absorption axis of the polarizing film is uniaxially stretched in the width direction substantially orthogonal to the long axis direction. Type tenter stretching machine.

The polarizing film is usually used as a polarizing plate which is protected by a transparent protective film (also referred to as a protective film) on the surface. The type of the transparent protective film is not particularly limited, and cellulose esters such as cellulose acetate, cellulose acetate butyrate, and cellulose propionate, polycarbonate, polyolefin, polystyrene, polyester, etc. can be used. . The transparent protective film is usually supplied in a cylindrical form, and is continuously bonded so that the long axis direction coincides with the long polarizing film. Here, the alignment axis (slow phase axis) of the transparent protective film may be in any direction, but from the viewpoint of ease of operation, the alignment axis of the transparent protective film is preferably parallel to the long axis direction. Further, the angle between the slow axis (alignment axis) of the transparent protective film and the absorption axis (tensile axis) of the polarizing film is not particularly limited, and may be appropriately set in accordance with the purpose of the polarizing plate.

Further, in the case where the polarizing film is produced by using a uniaxial stretching type tenter stretching machine in the width direction, it is preferable to make the slow axis (alignment axis) of the transparent protective film and the absorption axis of the polarizing film (stretching) The axes are laminated substantially orthogonally.

The Re value of the transparent protective film is, for example, preferably less than 10 nm at 632.8 nm, more preferably 5 nm or less. From the viewpoint of such a low hysteresis, the polymer used as a transparent protective film is suitable for use in, for example, cellulose acetate, 芮尼尼库斯, 芮诺诺阿 (both manufactured by Nippon Otsuka Co., Ltd.), A polyolefin such as ARTON (manufactured by JSR Co., Ltd.). In addition, for example, it may be a non-multifocal optical resin material as described in JP-A-H08-110402 or JP-A-11-293116. Further, in the case of using cellulose acetate in a transparent protective film, it is preferable that Re and Rth are each less than 10 nm, more preferably 2, from the viewpoint of suppressing the change in hysteresis caused by the temperature and humidity of the environment. Below the nano.

The polarizing plate of the present invention has the optical compensation film of the present invention. The optical compensation film described above may be attached to the outer side of the polarizing film and the laminated body of the protective film, and may be directly attached to the surface of the polarizing film instead of the aforementioned pair from the viewpoint of thinning. One of the protective films. In this case, it is preferred to apply the polymer film of the optical compensation film to the side of the polarizing film. The optical compensation film and the polarizing film described above are preferably fixed by an adhesive from the viewpoint of preventing deviation of the optical axis and preventing invasion of foreign matter such as dirt. Specifically, the surface of the polarizing film and the surface of the optical compensation film (polymer film) are preferably adhered by an adhesive or adhered via an adhesive layer. The type of the adhesive is not particularly limited, and from the viewpoint of preventing the change in the optical characteristics of the constituent members, it is preferable that the processing is not required at the time of curing and drying in the adhesive treatment, and it is desirable that the processing is not performed. It takes a long time to harden and dry. From such a viewpoint, it is preferred to use a hydrophilic polymer-based adhesive or an adhesive layer.

For the formation of the above-mentioned adhesive layer, for example, an appropriate polymer such as an acrylic polymer, a polyoxymethylene polymer, a polyester, a polyurethane, a polyether or a synthetic rubber can be used. Transparent adhesive. Among these, an acrylic adhesive is preferable from the viewpoints of optical transparency, adhesive properties, weather resistance and the like. Further, the adhesive layer may be provided with the adhesiveness of the liquid crystal cell or the like on one side or both sides of the target polarizing plate as needed. In this case, when the adhesive layer is exposed on the surface, it is preferable to temporarily laminate the separator or the like to prevent contamination of the surface of the adhesive layer or the like while reaching the time of supplying it to the actual application.

A protective film having various functions such as water resistance, which is based on the transparent protective film, and an anti-reflection layer anti-glare treatment layer for preventing surface reflection or the like, may be formed on one surface or both surfaces of the polarizing film. Functional layer. The antireflection layer can be formed, for example, by coating and drying a fluorine-based polymer, or can be formed by forming a plurality of metal vapor deposited films, and other optical interference films can be suitably used. Moreover, the anti-glare treatment layer can be formed, for example, by applying a resin composition containing fine particles. Moreover, the anti-glare treatment layer described above can be formed by subjecting the surface-reflected light to diffusion by a method of imparting a fine uneven structure to the surface by a damascene process, a sanding process, or an etching process. For the microparticles used in the anti-glare treatment layer, for example, vermiculite having an average particle diameter of 0.5 to 20 μm and alumina, alumina and titania, zirconia, and tin oxide, indium oxide, and the like may be used. Inorganic fine particles having conductivity such as cadmium oxide or cerium oxide, and organic fine particles composed of a suitable polymer such as polymethyl methacrylate and polyurethane, or the like One or more of suitable substances.

Further, by including such fine particles in the above-mentioned adhesive or adhesive layer, the layer composed of the adhesive and the adhesive layer can have light diffusibility.

The optical properties and durability (short-term, long-term storage) of the polarizing plate of the present invention are preferably equal to or higher than those of commercially available ultra-high-contrast products (for example, HLC 2-5618 manufactured by Sanli Co., Ltd.). substance. Specifically, it is preferable that the visible light transmittance is 42.5% or more and the degree of polarization ({(Tp-Tc)/(Tp+Tc)}1/2≧0.9995 (however, Tp is parallel transmittance, Tc is vertical transmittance), The absolute value of the rate of change of the light transmittance before and after the case of leaving the atmosphere at 60 ° C and a humidity of 90% RH for 500 hours and at 80 ° C for 500 hours in a dry atmosphere is preferably 3% or less. More preferably, it is 1% or less, and the absolute value of the change rate of the degree of polarization is 1% or less, more preferably 0.1% or less.

In the polarizing plate of the present invention, for example, it is preferable to use a roll-to-roll (ROLL TO ROLL), a long protective film, a long polarizing film, and a long strip of the present invention. A total of three films of the optical compensation film are bonded together.

[Liquid Crystal Display Device] Hereinafter, a liquid crystal display device of the present invention will be described.

First, the liquid crystal display device of the present invention will be described using Figs. 1 and 2 . 1 is a schematic view showing a configuration of an example of a liquid crystal display device of the present invention; and FIG. 2 is a schematic view showing a configuration of an example of a polarizing plate of the present invention. The liquid crystal display device shown in Fig. 1 is an example of a liquid crystal display device of an electric field effect type, which is an example of a configuration in which a nematic liquid crystal having a negative dielectric anisotropy can be driven.

In Fig. 1, the liquid crystal display element has liquid crystal cells (5 to 8) and a pair of polarizing plates 1 and 14 disposed on both sides of the liquid crystal cell. A uniaxial or biaxial optical anisotropic layer 3 is disposed between the polarizing plate 1 and the liquid crystal cells 5 to 8, but the optical axis is disposed perpendicular to the layer between the polarizing plate 14 and the liquid crystal cells 5 to 8. The optically anisotropic layer 10 having substantially no uniaxiality of the optical axis in the plane. The liquid crystal cell is composed of the upper electrode substrate 5 and the lower electrode substrate 8, and the liquid crystal molecules 7 held by the liquid crystal molecules. The liquid crystal molecules 7 are controlled to be aligned approximately perpendicular to the substrate in the non-driving state in which the external electric field is not applied due to the directions 6 and 9 of the rubbing treatment performed on the opposing faces of the electrode substrates 5 and 8. direction. Further, the upper polarizing plate 1 and the lower polarizing plate 14 are laminated such that the absorption axis 2 and the absorption axis 15 thereof are substantially perpendicular to each other.

As shown in Fig. 2, the polarizing plates 1 and 14 are composed of a polarizing film 103 and protective films 101 and 105 which protect it. The polarizing plates 1 and 14 may also be the slow phase axes 102 and 106 parallel to the protective films 101 and 105 and the absorption axis 104 of the polarizing plate, because when it is in such a configuration relationship, the size and curl of the polarizing plate are It is difficult to occur and becomes a polarizing plate with high mechanical stability, so it is preferable. Further, when at least two axes composed of three thin films, for example, the retardation axis of the protective film on one side and the absorption axis of the polarizing film, or the slow phase axes of the protective films of the two films are substantially parallel, The same effect can be obtained.

In Fig. 1, the optically anisotropic layer 3 is constituted by an optically uniaxial or biaxial phase difference plate, and is not particularly limited, however, for example, it may be lowered a polymer such as an olefin polymer, a polycarbonate polymer, a polyallyl polymer, a polyester polymer or a polyfluorene, or a mixture of two or more of such polymers . Among these, it is preferable that it is excellent in controllability of the birefringence property, transparency, and heat resistance. The optically isotropic layer 3 is preferably biaxial. The optically anisotropic layer 3 preferably satisfies the following formulas (8) and (9), and more preferably exhibits wavelength dispersion of the following formula (10).

Equation (8) 70≦Re(550)≦180 Equation (9)30≦Rth(550)≦140 Equation (10)0.7≦Re(450)/Re(550)≦1.0

On the other hand, the optically anisotropic layer 10 is an optically anisotropic layer having the optical compensation film of the present invention. Preferably, it is a layer which does not substantially have an optical axis in the plane, has an optically negative refractive index anisotropy, and has an optical axis perpendicular to the plane. The absolute value of the refractive index anisotropy is preferably 0.060 to 0.085, and the in-plane retardation Re is preferably -10 to 10 nm. The optically anisotropic layer 10, as described above, is preferably a layer formed by a cholesteric liquid crystal phase of a rod-like liquid crystal compound, a layer formed by horizontal alignment (vertical alignment) of molecules of a discotic liquid crystal compound, or a coating schedule. The layer formed by the polymer material. The optically anisotropic layers 3 and 10 can cancel the image coloration of the liquid crystal cell and impart an increase in the viewing angle.

Further, the liquid crystal display device of Fig. 1 is an example in which the optically anisotropic layers 3 and 10 are individually one layer, but two or more optically anisotropic layers 3 and 10 may be provided.

In the first diagram, when the observer side is the upper side, the configuration shown in Fig. 1 is such that the optically anisotropic layer 3 is the polarizing plate 1 and the viewer-side liquid crystal cell substrate 5 disposed on the observer side. The optically isotropic layer 10 is disposed between the polarizing plate 14 on the back side and the back side liquid crystal cell substrate 8; however, the optically isotropic layer 3 and the optically isotropic layer 10 may be interchanged. . Further, both of the optically anisotropic layers 3 and 10 may be disposed between the polarizing plate 1 and the viewer-side liquid crystal cell substrate 5 disposed on the observer side, or may be polarized light disposed on the back side. Between the board 14 and the back side liquid crystal cell substrate 8.

Further, the optically anisotropic layer 3 may be integrated with the polarizing plate 1, or may be incorporated in the liquid crystal display element in a state of being integrated with the polarizing plate 1. For example, the optically anisotropic layer 3 may be formed of a polymer film and have a function as a protective film on the side of one of the polarizing films. Further, in the case where the optically anisotropic layer 3 is a layer formed of a liquid crystal composition, it is also possible to have a function of a protective film which supports the support of the support as a side of one of the polarizing films. In the latter case, for example, an integrated polarizing plate in which a transparent protective film, a polarizing film, a transparent protective film (also serving as a transparent support), and an optically anisotropic layer are laminated in this order is preferable. In the case where the above-mentioned integrated polarizing plate is incorporated in the liquid crystal display element, it is preferably from the outer side of the device (away from the side of the liquid crystal cell), in accordance with the transparent protective film, the polarizing film, and the transparent protective film (and transparent) The order of the support and the optically anisotropic layer 3 is incorporated. In the case of producing an integrated polarizing plate, it is preferred to use a retardation axis of the optically anisotropic layer 3 (or a laminate supporting the support and the optically anisotropic layer 3) and a laminated film. The absorption axis is attached substantially vertically.

As described above, the optically anisotropic layer 10 is part of the optical compensation film of the present invention. Similarly to the optically anisotropic layer 3 described above, the optically anisotropic layer 10 can be incorporated in the liquid crystal display element as an integrated polarizing plate integrated with the polarizing plate 14. In the aspect in which the optically anisotropic layer 10 is a layer formed of a composition containing a liquid crystalline compound, the protective film on one side of the polarizing plate 14 may be a polymer film of a support of the optical anisotropic layer 10. . In such an aspect, it is preferable to form an integrated polarizing plate in which a transparent protective film, a polarizing film, a polymer film, and an optically anisotropic layer 10 are laminated in this order, and the integrated polarizing plate is used. From the outside (away from the side of the liquid crystal cell), the transparent protective film, the polarizing film, the polymer film, and the optically anisotropic layer 10 are sequentially incorporated into the liquid crystal display device.

The liquid crystal cell of the liquid crystal display device of Fig. 1 is preferably a vertical alignment mode (VA mode). The liquid crystal cell of the VA mode has a liquid crystal layer formed by sealing a liquid crystal molecule 7 having a negative dielectric anisotropy between the upper and lower substrates 5 and 8 which have been rubbed on the opposite surface. For example, liquid crystal molecules having Δn=0.0813 and Δε=−4.6 can be used to produce a liquid crystal cell in which the orientation direction (ie, the tilt angle) of the liquid crystal molecules is about 89°. At this time, the thickness d of the liquid crystal layer can be set to about 3.5 μm. The brightness of the white display will vary with the thickness d (nano) of the liquid crystal layer and the product of the refractive index anisotropy Δn Δn. The size of d varies. In order to obtain maximum brightness, the thickness d of the liquid crystal layer is preferably in the range of 2 to 5 μm (2000 to 5000 nm), and Δn is in the range of 0.060 to 0.085. Here, the refractive index anisotropy Δn represents Δn=Rth/film thickness (nano).

A transparent electrode (not shown) is formed on the inner side of the substrate 5 and the substrate 8, but the liquid crystal molecules 7 in the liquid crystal layer are aligned substantially perpendicular to the substrate in a non-driving state in which no driving voltage is applied to the electrodes. On the faces of 5 and 8, as a result, the polarization state of the light passing through the liquid crystal panel hardly changed. As described above, since the absorption axis 2 of the upper polarizing plate 1 of the liquid crystal cell and the absorption axis 15 of the lower polarizing plate 14 become substantially vertical, light does not pass through the polarizing plate. That is, in the liquid crystal display element of Fig. 1, the black state is obtained in the non-driving state. On the other hand, in the driving state, the liquid crystal molecules are inclined in a direction parallel to the substrates 5 and 8, and the light passing through the liquid crystal panel changes the polarization state due to the tilted liquid crystal molecular weight, and passes through the polarizing plate, that is, the white state.

The VA mode is characterized by high speed response and high contrast. However, the contrast has a problem of being high on the front side but low in the oblique direction. The liquid crystal molecules in the black display are vertically aligned to the substrate surface. When viewed from the front, since the liquid crystal molecules have almost no birefringence, the transmittance is low and high contrast is not obtained. However, in the case of observing from an oblique direction, liquid crystal molecules undergo birefringence. Further, the angle of intersection of the upper and lower polarizing plates absorbs the axis, which is a right angle of 90° from the front, but is greater than 90° when viewed from the oblique direction. Due to these two factors, light leakage tends to occur in the oblique direction, and the contrast tends to decrease. Further, in the case where the liquid crystal cell is subjected to birefringence, when viewed from an oblique direction in a black state, a change in color taste is observed. In the present invention, in order to solve such problems, an optical compensation film (10 in Fig. 1) of the present invention comprising a polymer film satisfying predetermined optical characteristics and an optically anisotropic layer is disposed. Further, in the liquid crystal display device of Fig. 1, since the uniaxial or biaxial optical anisotropic layer 3 is disposed, light leakage or the like in the oblique direction in the black state can be further reduced.

In the first drawing, an example is shown in which a liquid crystal material having a negative dielectric constant such that the liquid crystal molecules 7 are vertically responsive to the direction of the electric field due to an electric field applied between the upper and lower substrates 5 and 8 is used. Further, in the case where an electric field is applied to the substrate on one side of the electrode and in the lateral direction parallel to the substrate surface, a liquid crystal material having a positive dielectric constant anisotropy can be used. Further, in the liquid crystal display device of the VA mode, although the addition of the filter material used in the Twisted Nematic mode liquid crystal display device is generally used, the dynamic response characteristics are deteriorated and are rarely used, but there are also Reduce the addition of poor alignment.

In the VA mode, the liquid crystal molecules are obliquely aligned in the white display, but in the opposite direction to the oblique direction, the magnitude of the birefringence of the liquid crystalline molecules when viewed from the oblique direction is different, and the difference in brightness and hue is generated. In order to solve this, the liquid crystal cell is preferably a multidomain. The so-called complex field means that a plurality of fields having different alignment states are formed in one pixel. For example, among the liquid crystal cells of the VA mode of the complex field mode, there are a plurality of fields in which one pixel has different inclination angles of liquid crystal molecules when an electric field is applied. Among the liquid crystal cells of the VA mode of the complex field mode, the tilt angle of the liquid crystal molecules caused by the application of the electric field can be averaged for each pixel, whereby the viewing angle characteristics can be averaged. The splitting is arranged in one pixel, and the unevenness of the electric field density is maintained by providing slits on the electrodes, providing protrusions, and changing the direction of the electric field. This number of divisions can be increased to obtain an equal angle of view in all directions.

Further, at the boundary of the domain of the alignment division, the liquid crystal molecules are difficult to respond. Therefore, in the normal block display, there is a problem that the brightness is lowered due to the black display. Adding a filter to the liquid crystal material will cause the boundary area to shrink.

The liquid crystal display device of the present invention is not limited to the configuration shown in Fig. 1, and may include other members. For example, a color filter may be disposed between the liquid crystal cell and the polarizing film. Moreover, in the aspect of the transmissive liquid crystal display device, the backlight may be disposed on the back surface with a cold cathode or a hot cathode fluorescent tube, or a light emitting diode, a field emission element, and an electroluminescent element as a light source. . On the other hand, in the reflective liquid crystal display device, one polarizing plate may be disposed only on the observation side, or a reflective film may be provided on the back surface of the liquid crystal cell or the inner surface of the liquid crystal cell lower substrate. Needless to say, it is of course also possible to provide frontlight on the observation side of the liquid crystal cell using the aforementioned light source. Furthermore, a semi-transmissive type in which a transmissive portion and a reflecting portion are provided in one pixel of the display device may be used.

The type of the liquid crystal display device of the present invention is not particularly limited, and includes any liquid crystal display element of any of an image direct view type, a video projection type, and a light modulation type. In the present invention, it is particularly effective to apply an active matrix type liquid crystal display device using a three-terminal or two-terminal semiconductor element such as a TFT or an MIM. Needless to say, it is of course possible to effectively apply a passive matrix type liquid crystal display device typified by a super twisted nematic type (Super Twisted Nematic type, STN type) called time division driving.

[Examples]

Hereinafter, the features of the present invention will be more specifically described by way of examples and comparative examples. The materials, the amounts, the ratios, the processing contents, the processing order, and the like shown in the following examples can be appropriately changed without departing from the scope of the invention. Therefore, the present invention should not be construed as being limited to the specific examples shown below.

First, an embodiment and a comparative example of the first aspect of the present invention will be described.

[Example 1-1]

A deuterated cellulose film was used as a polymer film, and an optically anisotropic layer on which a polymerizable disc-like compound was horizontally aligned and then fixed by polymerization was formed thereon to prepare an optical compensation film. Hereinafter, the production method and evaluation results will be described.

(Preparation of a polymer film T1 having a wavelength-dispersible property) <Preparation of a cellulose-deposited solution> The following composition was placed in a mixing tank, and the components were dissolved by stirring to prepare a cellulose-deposited solution A.

<Preparation of Matting Agent Solution> The following composition was placed in a disperser, and the components were dissolved by stirring to prepare a matting agent solution.

<Preparation of Wavelength Dispersion Control Agent Solution> The following composition was placed in a mixing tank, stirred while being heated, and each component was dissolved to prepare a wavelength dispersion controlling agent.

95.7 parts by mass of the above-described deuterated cellulose solution A, 1.3 parts by mass of the matting agent solution, and 3.6 parts by mass of the ultraviolet absorbent solution were mixed and mixed, and cast by a band casting machine at a width of 1600 mm. . When the residual solvent content is 50% by mass, the film is peeled off from the tape, and the film is held by a tenter at 100 ° C, and the film is stretched at a draw ratio of 4%, and dried until the residual solution content becomes 5 mass% (dry 1). Further, the film was kept at 100 ° C for 30 seconds as it was after stretching. The film was loosened from the tenter clip, and after 5% of each of the two ends of the film was cut, further in the state of being free (unheld) in the direction of the web, after passing through a drying zone of 135 ° C in 20 seconds (Dry 2), the film was taken up on a roll. The obtained deuterated cellulose film had a residual solvent amount of 0.1% by mass and a film thickness of 81 μm. It was used as a polymer film T1 which is a wavelength-dispersible.

(Production of polymer film T2 to T6 having a wavelength-dispersible property) The same as the above except that the type of the deuterated cellulose, the type of the additive, the amount of the additive, and the thickness of the film were changed to those in Table 1-1. The polymer film T2~T6 is formed into a wavelength-dispersible polymer film.

(Production of Deuterated Cellulose Film (TR1)) The following composition was placed in a mixing tank, stirred while being heated, and each component was dissolved to prepare a deuterated cellulose solution.

The resulting inner layer was blended with a dope and an outer layer using a three-layer co-casting die, and cast on a drum cooled to 0 °C. A film having a residual solvent amount of 70% by mass was peeled off from the drum, and both ends were fixed to a pin tenter, and a draw ratio in the conveyance direction was set to 110%, and drying was carried out at 80 ° C while being conveyed. Further, when the amount of the residual solvent became 10%, the drying was carried out at 110 °C. Then, drying was carried out at a temperature of 140 ° C for 30 minutes to produce a deuterated cellulose film (TR1) having a residual solvent of 0.3% by mass (outer layer: 3 μm, inner layer: 74 μm, outer layer: 3 μm). Optical properties of the obtained film: Re = 8 nm, Rth = 82 nm.

The prepared film was passed through a dielectric heating roller at a temperature of 60 ° C, and the temperature of the film was raised to 40 ° C, and then the alkali solution A of the following composition was applied by a strip coater to 14 ml/m ² . The vapor-type far-infrared heater (manufactured by Noritak Co., Ltd.) heated to 110 ° C was allowed to stand for 10 seconds, and pure water was applied to 3 ml/m ² using the same strip coater. At this time, the temperature of the film was 40 °C. Subsequently, the mixture was washed with a water jet machine and subjected to water cutting three times with an air knife, and then dried in a drying zone at 70 ° C for 2 seconds.

<Preparation of Optical Compensation Film F11> (Production of Optically Isotropic Layer) The following composition was continuously applied to the surface subjected to the alkalization treatment of the above-described fluorinated cellulose film (T1) by a wire coater. Orientation film coating solution. It was dried under a warm air of 60 ° C for 60 seconds, and further dried at a temperature of 100 ° C for 120 seconds to form an alignment film.

A coating liquid (S1) containing a discotic liquid crystal compound having the following composition was continuously applied onto the alignment film produced above by a wire coater. The film was transported at a speed of 20 meters per minute. The solvent was dried by a step of continuously heating from room temperature to 80 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the molecules of the discotic liquid crystalline compound. Continuing, the temperature of the film was maintained at 90 ° C, and a high-pressure mercury lamp was used to irradiate 500 mJ/cm ² of UV light to fix the alignment of the disc-shaped molecules to form an optical anisotropic layer, thereby producing an optical compensation according to the first aspect of the invention. Film F11.

From the optical compensation film F11 to be produced, only the optically anisotropic layer formed using the discotic liquid crystalline compound was peeled off, and it was measured using an automatic complex refractometer (KOBRA-21ADH, manufactured by Oji Scientific Instruments Co., Ltd.). Optical properties. Re measured at a wavelength of 590 nm was 0 nm, and Rth was 163 nm. It was confirmed that the discotic liquid crystalline molecules were substantially horizontally aligned optically anisotropic layers with respect to the film surface.

Further, the film thickness of the optically anisotropic layer was 2.15 μm.

<Preparation of Optical Compensation Films F12 to F16> The optical compensation film F11 produced as described above is further changed to the cellulose-deposited cellulose film (T1) to be a cellulose-deposited film (T2) to (T6), and further The optical compensation films F12 to F16 of the first aspect of the present invention were produced by adjusting the film thickness of the optically anisotropic layer so that the Rth of the optical compensation film was 200 nm.

<Preparation of Optical Compensation Films F17 to F18> For the optical compensation film F11 produced as described above, the cellulose film (T1) produced as described above and commercially available cellulose acetate (Fujitack TD80UF, Fuji Photo Film) ) company system, Re: 2 nm, Rth: 46 nm) instead of the cellulose film (T1), and the film of the optically anisotropic layer was adjusted so that the Rth of the optical compensation film became 200 nm. The optical compensation films F17 and F18 of the comparative examples were produced in thickness.

The film thickness of the optically anisotropic layer of the optical compensation film produced above, Rth, Rth/d (the value of Rth divided by the film thickness of the optically isotropic layer), and the wavelength dispersibility: Rth (450) / Rth ( 550) and Rth of the optical compensation film, wavelength dispersibility: Rth (450) / Rth (550), and unevenness are listed in Table 1-4. Further, the unevenness of the optical compensation film was evaluated in accordance with the following evaluation method.

Set on a display box (schaukasten) in a dark room, set two polarizing plates to each other in a cross Nicol configuration. The optical compensation film of the sample was placed between two polarizing plates, and observed from a distance of 1 degree from the normal of 60 degrees, and the unevenness was evaluated according to the following criteria.

◎: Even if it was observed as much as possible, it was confirmed that no unevenness occurred. ○: It was almost impossible to confirm that unevenness occurred. ○ △: A little unevenness occurred. △: Partially visible unevenness. X: Unevenness can be seen in all aspects.

From the results shown in Table 1-4, the following things are obvious.

The optical compensation film F11 to F16 satisfying the polymer film of the formula (1-1) to the formula (1-3) has an Rth (450)/Rth (550) of 1.1 or more, which is capable of obtaining a high wavelength dispersion of Rth. Sex. On the other hand, the Rth(450)/Rth(550) of the optical compensation films F17 and F18 which do not satisfy the formula (1-1) to the formula (1-3) of the deuterated cellulose films TR1 and TD80UF are less than 1.1, and cannot Sufficient wavelength dispersion with respect to Rth is obtained. In particular, by using an optical compensation film F11 to F14 of a polymer film having an Rth (450) / Rth (550) of 1.3 or more, a very high wavelength dispersion of Rth (450) / Rth (550) of 1.15 or more can be obtained. .

In particular, a deuterated cellulose film having a wavelength absorption control agent A having a maximum absorption in the wavelength range of 250 nm to 400 nm and an additive D-5 represented by the formula (B), as shown by T2 and T3, are used. It is possible to obtain an optical characteristic in which Rth(590) is 40 nm or more; Rth(450)/Rth(550) using these optical compensation films F12 and F13 is very high at 1.15, and unevenness does not occur. The system is very good.

[Example 1-2]

An optical compensation film was produced by using a deuterated cellulose film as a polymer film, and an optically active nematic alignment of the polymerizable rod-like liquid crystal compound thereon, followed by polymerization to form an optically anisotropic layer. Hereinafter, the production method and evaluation results will be described.

<Preparation of Optical Compensation Film F22> An aligning film containing modified polyvinyl alcohol as a main component was formed on the deuterated cellulose film (T2) in the same manner as F12.

A coating liquid (S2) containing a rod-like liquid crystal compound having the following composition was continuously applied onto the alignment film produced above by a wire coater. The film was transported at a speed of 20 meters per minute. The solvent was dried by a step of continuously heating from room temperature to 80 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the molecules of the rod-like liquid crystalline compound. Continuing, the film temperature was maintained at 90 ° C, and a high-pressure mercury lamp was used to irradiate 100 mJ/cm ² of UV light to fix the alignment of the molecules of the rod-like liquid crystal compound to form an optical anisotropic layer, thereby producing the first aspect of the invention. Optical compensation film F21.

From the optical compensation film F21 to be produced, only the optically anisotropic layer formed using the discotic liquid crystalline compound was peeled off, and the measurement was performed using an automatic complex refractometer (KOBRA-21ADH, manufactured by Oji Scientific Instruments Co., Ltd.). Optical properties. Only the Re of the optically anisotropic layer measured at a wavelength of 590 nm was 0 nm, and Rth was 143 nm.

<Preparation of Optical Compensation Films F23 and F25 to F26> The optical compensation film F22 produced as described above was changed to a cellulose-deposited film (T3) and T(5) to (T). In addition to T6), the film thickness was further adjusted, and the optical compensation films F23 and F25 to F26 of the first aspect of the present invention were produced by setting the Rth of the optical compensation film to 200 nm.

<Preparation of Optical Compensation Films F27 to F28> The optical compensation film F22 produced above was replaced with a cellulose-deposited film (T2), which was replaced with a cellulose-deposited film (TR1), and a commercially available cellulose acetate film. (Fujitack TD80UF, manufactured by Fuji Photo Film Co., Ltd., Re: 2 nm, Rth: 46 nm), the film thickness of the optically anisotropic layer was further adjusted to make the Rth of the optical compensation film 200 nm. The optical compensation films F7 and F28 of the first aspect of the present invention were produced.

The evaluation results of the optical compensation film produced above were summarized in Tables 1-5. The evaluation method is the same as the above-described Example 1-1.

From the results shown in Table 1-5, the following things are obvious.

It can be understood that even in the case of the optical compensation film using the same polymer film, compared with the optical compensation film having the optical anisotropic layer formed by using the cholesteric liquid crystal phase shown in Table 1-5, The optical compensation film having an optically anisotropic layer formed by the vertical alignment of the discotic liquid crystals shown in Tables 1-4 exhibits a relatively high wavelength dispersibility with respect to Rth.

It can also be understood that the optical compensation films F22 and F25 to F26 which satisfy the polymer film of the formula (1-1) to the formula (1-3) exhibit an Rth (450)/Rth (550) of 1.1 or more, and about Rth. High wavelength dispersion; however, using an optical compensation film that does not satisfy the TD80UF of the formula (1-1) to the formula (1-3) has an Rth(450)/Rth(550) of less than 1.1, indicating insufficient wavelength dispersion. Sex.

It can also be understood that an optical compensation film having an optically anisotropic layer formed by using a cholesteric liquid crystal phase on a polymer film having Rth(450)-Rth(550) of less than -5 nm, Rth(450)/Rth (550) is approximately 1 and does not exhibit positive wavelength dispersion. Therefore, in the aspect of the optical compensation film having the optical anisotropic layer formed by the cholesteric liquid crystal phase on the polymer film, it is important to set Rth(450)-Rth(550) to -5 nm or more.

Further, it can be understood that the optical anisotropic layer formed by using the vertical alignment phase of the discotic liquid crystal has a thin film thickness as compared with the optical anisotropic layer formed by the cholesteric liquid crystal phase. Since a high Rth tends to be obtained, it is possible to form a layer which is more free from coating unevenness and exhibits uniform optical characteristics. It can be understood that even in the case of an optical compensation film having an optical anisotropic layer formed by the vertical alignment of the discotic liquid crystal on the polymer film, when Rth (590) is used, it is 80 nm or more. When the Rth (450)-Rth (550) is a -5 nm or more deuterated cellulose film, an optical compensation film having no unevenness and high wavelength dispersibility can be obtained.

[Example 1-3]

After the deuterated cellulose film and the polymerizable disc-like compound having high wavelength dispersibility thereon are horizontally aligned (vertical alignment), the optically anisotropic layer is formed by polymerization to form a wavelength-dispersion layer. High optical compensation film. Hereinafter, the production method and the evaluation results thereof will be described.

An alignment film containing modified polyvinyl alcohol as a main component was formed on the deuterated cellulose film (T1) in the same manner as in F11.

A coating liquid (S3) containing a discotic liquid crystal compound having the following composition was continuously applied onto the alignment film produced above by a wire coater. The film was transported at a speed of 20 meters per minute. The solvent was dried by a step of continuously heating from room temperature to 80 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the molecules of the discotic liquid crystalline compound. Continuing, the temperature of the film was maintained at 90 ° C, and a high-pressure mercury lamp was used to irradiate 500 mJ/cm ² of UV light to fix the alignment of the disc-shaped molecules to form an optical anisotropic layer, thereby producing an optical compensation according to the first aspect of the invention. Film F31.

Polymerization initiator A

From the optical compensation film F31 to be produced, only the optically anisotropic layer formed of the discotic liquid crystalline compound was peeled off, and it was measured using an automatic complex refractometer (KOBRA-21ADH, manufactured by Oji Scientific Instruments Co., Ltd.). Optical properties. Re measured at a wavelength of 590 nm was 0 nm, and Rth was 163 nm. It was confirmed that an optically anisotropic layer in which the discotic liquid crystal molecules are substantially horizontally aligned with respect to the film surface has been formed.

<Preparation of Optical Compensation Films F32 to F36> The optical compensation film F31 produced as described above is further changed to the cellulose-deposited film (T1) to the cellulose-deposited film (T2) to (T6), and further The optical compensation films F32 to F36 of the first aspect of the present invention were produced by adjusting the film thickness so that the Rth of the optical compensation film was 200 nm.

The evaluation results of the optical compensation film produced above were summarized in Tables 1-6. The evaluation method is the same as the above-described Example 1-1.

From the results shown in Table 1-6, the following things are obvious.

It can be understood that a combination of a polymer film having a high wavelength dispersibility and an optical anisotropic layer which is vertically aligned by a discotic liquid crystal having a high wavelength dispersibility can provide no unevenness and high wavelength dispersion. Optical compensation film.

[Example 1-4]

<Production of Liquid Crystal Display Device> 1% by weight of octadecyldimethylammonium chloride (coupling agent) was added to an aqueous solution of 3 wt% of polyvinyl alcohol. This was spin-coated on a glass substrate with an ITO electrode, and heat-treated at 160 ° C, followed by rubbing treatment to form a vertical alignment film. The rubbing treatment is carried out in such a manner that two glass substrates are oriented in opposite directions. The two glass substrates were combined in such a manner that the cell gap (d) became about 5.0 μm. A liquid crystal compound (Δn: 0.06) mainly composed of an ester system and an ethane group was injected into a cell gap to prepare a vertical alignment liquid crystal cell A. The product of Δn and d is 300 nm.

(Preparation of the upper polarizing plate) The polycarbonate film "Pure Ace WR" made by Teijin Chemical Co., Ltd. was heat-reduced to near Tg, and the second optical compensation was obtained in which Re was 120 nm and Rth was 70 nm. Film A.

A cylindrical polyvinyl alcohol film having a thickness of 80 μm continuously dyed in an aqueous iodine solution was stretched 5 times in the transport direction and dried to obtain a long polarizing film. The second optical compensation is applied to the surface of one side of the polarizing film by using a polyvinyl alcohol-based adhesive so that the transmission axis of the polarizing film and the slow axis of the second optical compensation film A are parallel. Film A; on the other side, a polyvinyl alcohol-based adhesive was used, and a commercially available cellulose acetate film (Fujitack TD80UL, Fuji Photo Film Co., Ltd.) was continuously attached thereto. It is made into the upper polarizing plate (P1).

(Production of lower polarizing plate) The optical compensation film (F11) and Fujitack TD80UF produced above were alkalized, and a polyvinyl alcohol-based adhesive was attached to the polarizing film by a roll to roll. An integrated polarizing plate (P11) is produced on both sides. At this time, the optical compensation layer of the optical compensation film is directed to the outside of the polarizing plate.

For the integrated polarizing plate (P11), replace the optical compensation film (F11) with the optical compensation films (F12) to (F18), (F22) to (F28), and (F31) to (F36). The integrated polarizing plates (P12) ~ (P18), (P22) ~ (P28) and (P31) ~ (P36) are produced.

In addition, the optical compensation film (F11) was replaced with a commercially available low hysteresis TAC (z-TAC, manufactured by Fuji Photo Film Co., Ltd.) for the integrated polarizing plate (P11) produced as described above. Polarizer (P0).

(Incorporating the polarizing plate) When the laminated angle of each film is based on the left-right direction when viewed from above the display device (0°), as shown in FIG. 2, the polarizing film is absorbed by the axis 104 ( In the first plan, the axis angle of 15) is set to 90°, and the angles of the protective film slow-phase axes 102 and 106 are set to 90°. Each of the optical compensation films produced as described above is formed such that the optically anisotropic layer (10 in Fig. 1) and the liquid crystal cell substrate (8 in Fig. 1) are in contact with each other (polarized plate (P0)) The Z-TAC is connected to the liquid crystal cell substrate, and is incorporated between the lower polarizing plate and the liquid crystal cell. Further, the polarizing plate produced above was used as the lower polarizing plate.

Moreover, the upper polarizing plate (1 in Fig. 1) produced as described above is incorporated in the upper liquid crystal cell substrate (5 in Fig. 1) with the second optical compensation film A as the substrate side. At this time, the slow phase axis of the second optical compensation film A is configured to match the transmission axis of the upper polarizing plate.

A liquid crystal display device in which the optical compensation film of the first aspect of the present invention produced as described above was incorporated as shown in Table 1-7 was produced. With respect to the liquid crystal display devices manufactured as described above, the light leakage in the front and oblique directions, the color shift and the unevenness when viewed from the front and the oblique direction were evaluated by the following methods, and are summarized in Table 1-7.

(1) Light leakage (front) is placed on the display box in the dark room, and the liquid crystal cell is placed in a state where the polarizing plate is not attached, so as to set the luminance meter at a distance of 1 meter from the normal direction (spectral radiance meter CS) -1000: manufactured by MINOLUTA Co., Ltd.) The brightness 1 was measured.

Next, each liquid crystal display device to which the polarizing plate was attached was placed on the same display case as described above, and the brightness 2 was measured in the same manner as described above to indicate that the ratio of the brightness to the brightness 1 was light leakage.

(2) Light leakage (oblique direction) is placed on the display box in the dark room, and the liquid crystal cell is placed in a state where the polarizing plate is not attached, and the rubbing direction of the liquid crystal cell is used as a reference, and the setting is in the 45-degree orientation in the left direction. A luminance meter (measured by a spectroradiometer CS-1000: manufactured by MINOLUTA Co., Ltd.) at a distance of 1 m in the direction of 60 degrees from the normal direction of the liquid crystal cell was measured.

Next, each liquid crystal display device to which the polarizing plate was bonded was placed on the same display case as described above, and the brightness 2 was measured in the same manner as described above to indicate that the brightness was leaked obliquely with respect to the luminance of 1 of 100.

(3) The color shift (front) in the black display is placed on the display box set in the dark room, and the liquid crystal cell in the state in which the polarizing plate is attached is placed, and the liquid crystal cell is observed at a distance of 1 m from the normal direction, as described below. The benchmark evaluates the color and its intensity.

○: A specific color taste cannot be seen. ○ Δ: A slight specific color odor was observed. △: A little specific color smell was observed. ×: A specific color taste can be clearly seen.

(4) The color shift (oblique direction) in the black display is set on the display box in the dark room, and the liquid crystal cell in the state in which the polarizing plate is attached is placed, and the rubbing direction of the liquid crystal cell is used as a reference, and 45 degrees from the left direction The degree of orientation was observed at a distance of 1 m from the normal direction of the liquid crystal cell at 60 degrees, and the color shift at the time of black display was evaluated on the same basis as the above (3).

(5) The unevenness is set on the display box in the dark room, and the liquid crystal cell A in a state in which the polarizing plate is not attached is placed in such a manner that the substrate on which the electrode is formed is on the side of the display case, and the rubbing direction of the liquid crystal cell is made. For the reference, the angle was measured at a distance of 45 degrees from the left direction and at a distance of 1 meter from the normal direction of the liquid crystal cell, and the unevenness was evaluated according to the following criteria.

◎: Even if you observe it with great force, you cannot confirm that there is unevenness. ○: It was almost impossible to confirm that unevenness occurred. ○ △: slight unevenness occurred. △: Partially visible unevenness ×: Unevenness was observed in all aspects.

From the results of Table 1-7, the following things are obvious.

The optical compensation film according to the first aspect of the present invention is used for an optically compensated liquid crystal display device (L1 to L16, L26, L31, and L32) which vertically aligns the liquid crystal cells A, and has less unevenness, less light leakage in the front side and the oblique direction. And the liquid crystal display device (L17, L18, and L28) which is less in color shift when viewed from the front side and the oblique direction, and the liquid crystal display device (L0) which does not use the optical compensation film and the optical compensation film which uses the comparative example which replaces it In comparison, the system exhibits particularly excellent display characteristics.

Hereinafter, examples and comparative examples of the second aspect of the present invention will be described.

[Example 2-1]

(Preparation of Transparent Support C1) (Preparation of Cellulose Acetate Solution) The following composition was placed in a mixing tank, and the components were dissolved by stirring to prepare a cellulose acetate solution A.

Composition of cellulose acetate solution A

(Preparation of a matting agent solution) 20 parts by mass of vermiculite particles having an average particle diameter of 16 nm (AEROSIL R972, manufactured by Erosud Co., Ltd., Japan) and 80 parts by mass of methanol were thoroughly stirred and mixed for 30 minutes. It is prepared into a dispersion of vermiculite particles. This dispersion liquid was placed in a dispersing machine together with the following composition, and further stirred for 30 minutes or more, and each component was dissolved to prepare a matting agent solution.

Composition of matting agent solution

(Preparation of Additive Solution) The following composition was placed in a mixing tank, stirred while being heated, and each component was dissolved to prepare a cellulose acetate solution.

Composition of the solution

Optical anisotropy reducer

(Production of Cellulose Acetate Film) 94.6 parts by mass of the above cellulose acetate solution A, 1.3 parts by mass of the matting agent solution, and 4.1 parts by mass of the additive solution were separately filtered and mixed, and band casting was used. The machine is casting. In the above composition, the mass ratio of the compound which reduces optical anisotropy and the wavelength dispersion adjusting agent to cellulose acetate is 12% and 1.2%, respectively. When the residual solvent content was 30% by mass, the film was peeled off from the belt and dried at 140 ° C for 40 minutes to produce a long-length cellulose acetate film T0 having a thickness of 80 μm. The in-plane retardation (Re) of the obtained film was 1 nm (the slow phase axis was perpendicular to the longitudinal direction of the film), and the retardation (Rth) in the thickness direction was -1 nm. This object was used as the transparent support C1.

The dielectric heating roller having a temperature of 60 ° C was passed through the transparent support C1 prepared above, and the surface temperature of the film was raised to 40 ° C, and then a bar coater was used to coat a coating amount of 17.3 mL/m ² . The coating speed at a meter/min is applied to an alkali solution (S-1) as shown below, and is heated (alkaline temperature) to 110 ° C under a vapor-type far infrared heater manufactured by Noritak Co., Ltd. Stay 8 seconds (alkaline time). Next, 2.8 mL/m ² of pure water was applied using the same bar coater. The film temperature at this time was 40 °C. Next, the water was washed with a water jet machine and water-cut by an air knife was repeated four times, and then dried in a drying zone at 70 ° C for 5 seconds to be dried, and alkalized.

On the alkalized surface of the transparent support C1 subjected to the alkalization treatment, an alignment film coating liquid having the following composition is applied and dried to form an alignment film.

(Composition of alignment film coating liquid) The following modified polyvinyl alcohol 10 parts by mass of water 371 parts by mass of methanol 119 parts by mass of glutaraldehyde (crosslinking agent) 0.5 parts by mass

(Preparation of the coating liquid for the optically anisotropic layer C2) The following composition was dissolved in 102 kg of methyl ethyl ketone to prepare a coating liquid.

The following liquid crystalline compound (1) 41.01 parts by mass of ethylene oxide-modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 4.06 parts by mass of the following polymer A-1 0.13 parts by mass of the following photopolymerization initiator 0.90 parts by mass Polymer A-1

The composition of the optically anisotropic layer C2 described above was dissolved in 102 parts by mass of methyl ethyl ketone to prepare a coating liquid, which was continuously applied to the surface of the above alignment film by a linear rod of #4.2. The mixture was heated at 130 ° C for 1 minute to align the discotic liquid crystalline compound. Next, UV was irradiated with a high-pressure mercury lamp of 120 W/cm at 100 ° C to polymerize the discotic liquid crystalline compound. Then, it was left to cool to room temperature. The obtained optically anisotropic layer had a Re of 0.5 nm measured at a wavelength of 550 nm and an Rth of 180 nm, which satisfies the optical characteristics required for the optical anisotropic layer C2.

(Evaluation of Adhesiveness of Optical Compensation Sheet) The adhesion of the optical compensation sheet was measured and evaluated in accordance with the 8.5.2 checkerboard method of JIS K 5400. However, the evaluation was carried out using the polyester adhesive tape NO31RH manufactured by Nitto Denko Corporation. The results are shown in the table.

<Preparation of Polarizing Plate of Optical Compensation Sheet> A cylindrical polyvinyl alcohol film having a thickness of 80 μm continuously dyed in an aqueous iodine solution was stretched 5 times in the transport direction and dried to obtain a long polarizing film. On the surface of one side of the polarizing film, the above-mentioned optical compensation sheet (K-1) which has been alkalized is continuously bonded using a polyvinyl alcohol-based adhesive, and the surface on the other side is bonded. An alkali-treated cellulose acetate film (Fujitack TD80UL, manufactured by Fuji Photo Film Co., Ltd.) which was alkalized was used to prepare an upper polarizing plate (P-1).

(Preparation of the optical anisotropic layer A) The polycarbonate film "Pure Ace WR" manufactured by Teijin Chemical Co., Ltd. was heat-reduced to the vicinity of Tg, and optical with Re of 120 nm and Rth of 78 nm was obtained. The unidirectional layer A.

<Preparation of polarizing plate with optical anisotropic layer A> A cylindrical polyvinyl alcohol film having a thickness of 80 μm continuously dyed in an aqueous iodine solution was stretched five times in the transport direction, and dried to obtain a long strip. Polarized film. On the surface of one side of the polarizing film, the above-mentioned optical anisotropy is bonded so that the transmission axis of the polarizing film and the slow axis of the optically anisotropic layer A are parallel to each other by using a polyvinyl alcohol-based adhesive. On the other side of the surface, a commercially available cellulose acetate film (Fujitack TD80UL, manufactured by Fuji Photo Film Co., Ltd.) was continuously bonded to the surface by using a polyvinyl alcohol-based adhesive. It is made into an upper polarizing plate (P-A1).

The mounting of the VA panel is performed on one of the liquid crystal display devices (LC-37GE2) using a vertical alignment type liquid crystal cell, and the polarizing plate and the pair of optical compensation sheets are peeled off, and the liquid crystal cell is taken out. .

The polarizing plate P-1 produced as described above is attached to the liquid crystal cell on the backlight side via an adhesive so that the optically anisotropic layer C2 becomes the liquid crystal cell side. Further, the optically anisotropic layer A is formed. In the liquid crystal cell side, the polarizing plate P-A1 produced on the opposite side of the polarizing plate P-1 is attached to the liquid crystal cell on the opposite side of the polarizing plate P-1, instead of being disposed in the vertical alignment type liquid crystal cell. A pair of polarizing plates and a pair of optical compensation sheets on the liquid crystal display device. At this time, the transmission axis of the polarizing plate P-1 and the polarizing plate P-A1 are bonded to the liquid crystal cells in a cross shape. A rectangular voltage of 55 Hz was applied to the liquid crystal cells. The white display is 5V, and the black display is 0V in Normally Block Mode. Find the black display transmittance (%) for the black display at 0° azimuth, 60° polar angle, and between 0° azimuth, 60° polar angle and 180° azimuth, 60° polar angle The color shift is Δx. The results are shown in the table.

Color change (△x) ◎: less than 0.02○: 0.02~0.04 △: 0.04~0.06×: 0.06 or more

[Example 2-2]

An optical compensation sheet and a polarizing plate were produced in the same manner as in Example 2-1, except that the optically anisotropic layer C2, Re was 0.4 nm, and Rth was 160 nm. A liquid crystal display device was produced in the same manner as in Example 2-1, except that the polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-3]

An optical compensation sheet and a polarizing plate were produced in the same manner as in Example 2-1, except that the optically anisotropic layer C2, Re was 0.4 nm, and Rth was 200 nm in a linear bar of #4.8. A liquid crystal display device was produced in the same manner as in Example 2-1, except that the polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-4~Example 2-6]

In addition to changing the amount of the wavelength dispersion modifier used in the production of the transparent support C1, a cellulose-deposited film having a value of Re, Rth, Rth ₄₀₀ (C1)-Rth ₇₀₀ (C1) was used as a transparent support. An optical compensation sheet and a polarizing plate were produced in the same manner as in Example 2-1 to Example 2-3 except for the body C1. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-7~Example 2-9]

A cyclic olefin (COC) film produced by the following method was produced as a transparent support C1.

(Preparation of Transparent Support C1) The composition described above was placed in a pressure-resistant closed cell, and after stirring, it was heated to 80 ° C in warm water to dissolve each component. After cooling, filtration was carried out with a filter paper having an average pore diameter of 34 μm and a sintered metal filter having an average pore diameter of 10 μm.

Next, the following composition containing the cyclic polyolefin solution D-2 produced by the above method was placed in a disperser to prepare a matting agent.

100 parts by mass of the above cyclic polyolefin solution D-2 and 1.1 parts by mass of the matting agent dispersion M-2 were mixed to prepare a coating liquid for film formation. The above coating liquid was cast using a belt casting machine. The film which was peeled off from the tape at a residual solvent content of about 25% by mass was stretched at a stretching ratio of 2% in the width direction by a tenter, and dried while being kept hot so that the film did not wrinkle. . Then, it is transferred from the tenter to the roll conveyance, and further dried and curled at 100 ° C to 120 ° C. The produced COC film, as shown in the table, satisfies the optical characteristics of the transparent support C1.

The COC film produced above was subjected to corona treatment. An optical device was produced in the same manner as in Example 2-1 to Example 2-3 except that the COC film subjected to the corona treatment was used as the transparent support C1 instead of the cellulose acetate film subjected to the alkalization treatment. Compensation sheet, polarizing plate. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-10~Example 2-12]

A cyclic olefin (COC) film produced by the following method was produced as a transparent support C1.

(Production of Transparent Support C1) A cyclic olefin resin COP film was obtained in the same manner as in Examples 2-7 to 2-9 except for the coating liquid for film formation described below.

Arton G (manufactured by JSR Co., Ltd.) 100 parts by mass of dichloromethane 390 parts by mass of compound A-7 (manufactured by Tokyo Chemical Industry Co., Ltd.) 10.0 parts by mass

The COP film produced by the above method was subjected to corona treatment. An optical film was produced in the same manner as in Example 2-1 to Example 2-3 except that the COP film subjected to the corona treatment was used as the transparent support C1 instead of the cellulose acetate film subjected to the alkalization treatment. Compensation sheet, polarizing plate. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-13~Example 2-15]

The biaxially stretched lactone ring produced by the following method contains a polymer resin (LCA) film as a transparent support C1.

(The lactone ring contains a polymer resin) In a 30 L reactor equipped with a stirring device, a temperature sensor, a cooling tube, and a nitrogen introduction tube, 8000 g of methyl methacrylate (MMA) and 2000 g of 2-(2000 g) were charged. Methylol methacrylate (MHMA), 10,000 g of toluene, which was continuously heated with nitrogen gas until 105 ° C, refluxed, and 10.0 g of a tertiary aluminum peroxyisophthalate as a starter was added ( Affordable Finajifu, trade name: Ruparulu 570), while dropping a solution of 20.0 grams of the initiator and 100 grams of toluene in 4 hours, while refluxing (about 105 ~ 110 ° C) The solution was polymerized and further matured in 4 hours.

To the obtained polymer solution, a mixture of 10 g of phosphotearate/distearate (trade name: Phoslex A-18) was added under reflux (about 90 to 110 ° C). The cyclization condensation reaction was carried out for 5 hours. Next, the polymer solution obtained by the above cyclization condensation reaction was introduced into a barrel temperature of 260 ° C, a rotation number of 100 rpm, and a decompression degree of 13.3 in a conversion rate of 2.0 kg/hr. 400 hPa (10~300 mmHg), one venting port, and four ventilating ventilating twin-axis extruders (ψ=29.75 mm, L/D=30) The cyclization condensation reaction and devolatilization were carried out in an extruder, and a transparent lactone ring was obtained by extrusion to contain a polymer resin pellet (1A).

The lactone ring-containing polymer resin pellet (1A) had a lactone ring ratio of 97.0%, an average molecular weight of 147,700, a melt flow rate of 11.0 g/10 min, and a Tg (glass transition temperature) of 130 °C.

(Production of base film) The polymer resin pellet (1A) is contained in 100 parts of the lactone ring, and one part of TINUVIN 1577 (manufactured by Ciba Specialty Chemicals Co., Ltd.) and one part of Adekastab are mixed. LA-31 (made by Asahi Kasei Kogyo Co., Ltd.), 10 parts of acrylonitrile-styrene copolymer, 0.12 parts of zinc acetate as a foaming inhibitor, extruded by a T die from a mold temperature of 250 ° C by an extruder Press it out to obtain a stretched film at the end of 120 microns. The unstretched film was stretched 1.5 times in the longitudinal direction at 145 ° C, and stretched 1.8 times in the transverse direction at 145 ° C to obtain a biaxially oriented film having a thickness of 60 μm.

The LCA film produced by the above method was subjected to corona treatment. An optical device was produced in the same manner as in Example 2-1 to Example 2-3 except that the LCA film subjected to the corona treatment was used as the transparent support C1 instead of the cellulose acetate film subjected to the alkalization treatment. Compensation sheet, polarizing plate. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-16~2-18]

When the optically anisotropic layer C2 is formed, the surface of the alignment film is subjected to a rubbing treatment, and the optical anisotropic layer C2 is formed by coating with the following composition, and Re and Rth of the optically anisotropic layer C2 are formed. An optical compensation sheet and a polarizing plate were produced in the same manner as in Example 2-1 except that the film thickness was adjusted as shown in the table. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, but the change in color tone depending on the angle of view is a slight increase in the ratio 2-1, but it is still in a very good range.

(Composition of coating liquid containing a rod-like liquid crystalline compound)

[Example 2-19~2-21]

The LCA film produced by the above method was subjected to corona treatment. An optical compensation was prepared in the same manner as in Example 2-16 to 2-18, except that the LCA film subjected to the corona treatment was used as the transparent support C1 instead of the cellulose acetate film subjected to the alkalization treatment. Sheet, polarizing plate. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, but the change in color tone depending on the angle of view is a slight increase in the ratio 2-1, but it is still in a very good range.

[Example 2-22~2-24]

The discotic liquid crystal compound (1) used in the formation of the optically anisotropic layer C2 is replaced by the following discotic liquid crystal compound (2), and the Re and Rth of the optically isotropic layer C2 are replaced. An optical compensation sheet and a polarizing plate were produced in the same manner as in Example 2-1 except that the film thickness was adjusted as shown in the table. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table. However, the change in color tone depending on the angle of view was as small as in Example 2-1.

[Example 2-25~2-27]

The polymer A-1 of the horizontal alignment agent used in the formation of the optically anisotropic layer C2 is replaced by the polymer A-2 described below, and the Re and Rth of the optically anisotropic layer C2 are An optical compensation sheet and a polarizing plate were produced in the same manner as in Example 2-1 except that the film thickness was adjusted as shown in the table. A liquid crystal display device was produced in the same manner as in Example 2-1 except that the obtained polarizing plate was used instead of the polarizing plate P-1, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, the color change according to the viewing angle was as small as in Example 2-1, which was good.

[Example 2-28]

A polymer film produced by the method described below was used as the transparent support C1.

(Production of Polymer 1) The following composition was placed in a four-necked flask (with an inlet, a thermometer, a circulation cooling tube, a nitrogen gas inlet, and a stirrer), and the temperature was gradually raised to 80 ° C, and the mixture was stirred while stirring. After the polymerization was completed for 5 hours, the polymer solution was poured into a large amount of methanol to precipitate it, and further washed with methanol, and purified and dried to obtain a polymer having a weight average molecular weight of 3,000 (measured by GPC). .

Methyl acrylate 10 parts by mass of 2-hydroxyethyl acrylate 1 part by mass of azobisisobutyronitrile (AIBN) 1 part by mass of toluene 30 parts by mass

(Production of Transparent Support C1) The coating liquid composition described below was placed in a pressure-tight container, heated to 70 ° C, and the pressure in the container was raised to 1 or more. The cellulose ester was completely dissolved while stirring, and the coating liquid was dissolved. The temperature was lowered to 35 ° C and left to stand overnight. After filtering the coating liquid using the number 244 filter paper made of filter paper, it was further allowed to stand for one night to remove the foam. Next, use the fine mesh NM (absolute filtration accuracy of 100 μm) and fine pore NF (using the order of absolute filtration accuracy of 50 μm, 15 μm, and 5 μm in order to improve the filtration accuracy) at 1.0 in fine mesh (manufactured by Nippon Seiki Co., Ltd.). Filtered under a filtration pressure of ×10 ⁶ Pa and supplied to a film formation. The film thickness was 40 microns.

(coating liquid composition) cellulose acetate (degree of substitution: 2.83) 100 parts by mass of the above-mentioned synthesized polymer 1 15 parts by mass of the following UV agent (1) 0.8 parts by mass of the following UV agent (2) 0.2 parts by mass Methyl chloride 475 parts by mass ethanol 50 parts by mass

The optical properties of the obtained polymer film are as shown in the table, which satisfy the requirements as the transparent support C1. An optically anisotropic layer C2 was formed in the same manner as in Example 2-16 except that the polymer film was used as the transparent support C1, and an optical compensation sheet and a polarizing plate were produced. Further, using this polarizing plate, a liquid crystal display device was produced in the same manner, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, although the change in color tone depending on the angle of view is a certain increase in the ratio 2-1, it is still very good.

[Example 2-29]

A deuterated cellulose film produced by the method described below was used as the transparent support C1.

(Production of Transparent Support C1) The following coating liquid composition was placed in a pressure-tight container, heated to 70 ° C, and the pressure inside the container was raised to 1 or more. The cellulose ester was completely dissolved while stirring, and the temperature of the coating liquid was adjusted. The mixture was allowed to stand at 35 ° C for one night, and the coating liquid was filtered using a number 244 filter paper made of Azure filter paper, and further allowed to stand overnight to remove the foam. Next, use the fine mesh NM (absolute filtration accuracy of 100 μm) and fine pore NF (using the order of absolute filtration accuracy of 50 μm, 15 μm, and 5 μm in order to improve the filtration accuracy) at 1.0 in fine mesh (manufactured by Nippon Seiki Co., Ltd.). Filtered under a filtration pressure of ×10 ⁶ Pa and supplied to a film formation. The film thickness was 40 microns.

(coating liquid composition) cellulose acetate (degree of substitution: 2.83) 100 parts by mass of the above-mentioned synthesized polymer 1 15 parts by mass of the following UV agent (1) 0.8 parts by mass of the following UV agent (2) 0.2 parts by mass Methyl chloride 475 parts by mass ethanol 50 parts by mass

The optical properties of the obtained polymer film are as shown in the table, which satisfy the requirements as the transparent support C1. An optically anisotropic layer C2 was formed in the same manner as in Example 2-16 except that the polymer film was used as the transparent support C1, and an optical compensation sheet and a polarizing plate were produced. Further, using this polarizing plate, a liquid crystal display device was produced in the same manner, and the color taste angle measurement was performed in the same manner. The results are shown in the table, however, although the change in color tone depending on the angle of view is a certain increase in the ratio 2-1, it is still very good.

[Example 2-30]

In the production of the polymer film of Examples 2-28, except that the film thickness was set to 80 μm, and the transparent support C1 in which the film thickness was adjusted so that Re and Rth were the displayed values, and Examples 2-28 were used. Similarly, an optical compensation sheet and a polarizing plate were separately produced. A liquid crystal display device was produced in the same manner using this polarizing plate, and the color taste angle measurement was performed in the same manner. The results are shown in the table, and the change in color tone depending on the angle of view is somewhat good in proportion to 2-1, but it is still very good.

[Example 2-31]

An optically anisotropic layer C2 was formed in the same manner as in Example 2-1 except that the polymer film produced in Example 2-30 was used as the transparent support C1, and an optical compensation sheet and a polarizing plate were produced. A liquid crystal display device was produced in the same manner using this polarizing plate, and the color taste angle measurement was performed in the same manner. The results are shown in the table. However, the change in color tone depending on the angle of view was as small as in Example 2-1.

[Example 2-32~2-34]

The polyimine layer formed by the following method and having a film thickness adjusted so that Re, Rth, and Rth450/Rth550 are displayed values is used as the optical anisotropic layer C2.

(Production of polyimine layer) will consist of 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane, and 2,2'-bis(trifluoromethyl)-4,4'-di A polybiimine having a weight average molecular weight (MW) of 120,000 formed by an aminobiphenyl group was dissolved in cyclohexanone to prepare a 15% by weight solution of a polyimine. Then, the above polyimine solution was applied to the transparent support C1 described in Example 2-1. The coated film was dried at 100 ° C for 10 minutes, and as a result, an optical compensation sheet having a film thickness of 5 μm to 6 μm was obtained, and an optical compensation sheet having optical characteristics as shown in the table was obtained, respectively. A polarizing plate was produced in the same manner as in Example 2-1, using these optical compensation sheets. Further, a liquid crystal display device was produced in the same manner, and the color taste angle measurement was performed. The results are shown in the table, but the color change system according to the viewing angle is similarly small and good in proportion 2-1.

[Example 2-35~2-37]

An optically anisotropic layer C2 was formed in the same manner as in Examples 2-32 to 2-34 except that the polymer film produced in Example 2-13 was used as the transparent support C1, and an optical compensation sheet and a polarizing plate were produced. A liquid crystal display device was produced in the same manner using this polarizing plate, and the color taste angle measurement was performed in the same manner. The results are shown in the table. However, the change in color tone depending on the angle of view was as small as in Example 2-1.

[Example 2-1']

In Example 2-1, the composition of the polymer A-1 was removed from the composition used for the formation of the optically anisotropic layer C2, and an optically anisotropic layer was formed in the same manner as in Example 2-1. The discotic liquid crystal compound is not aligned to form the optically anisotropic layer C2 having desired optical characteristics.

[Example 2-2']

A polymer film having a value of Re, Rth, and Rth 400-Rth 700 as a value shown in the table was used as a transparent support instead of the transparent support C1 of Example 2-1. A liquid crystal display device was produced in the same manner as in Example 1 except for the above. Similarly, as a result of measuring the color taste angle, it was revealed that the change in white taste was deteriorated.

[Example 2-3']

The film thickness was adjusted in such a manner that the transparent support C1 of Example 2-1 was replaced with a polymer film having Re as a value shown in the table, and the Rth of the optically anisotropic layer C2 was changed to a value as shown in the table. A liquid crystal display device was produced in the same manner as in Example 1. Similarly, as a result of measuring the color taste angle, it was revealed that the change in white taste was deteriorated.

[Example 2-4']

A liquid crystal display device was produced in the same manner as in Example 2-1 except that a polymer film having a value of Rth 400-Rth 700 was used instead of the transparent support C1 of Example 2-1. Similarly, as a result of measuring the color taste angle, the white taste change was slightly deteriorated.

Further, the polyfunctional monomer (ethylene oxide-modified trimethylolpropane triacrylate (V#360, Osaka Organic Chemistry) was removed from the composition used for the formation of the optically anisotropic layer C2 of Example 2-1. An optical compensation sheet was produced in the same manner as in Example 2-1 except that an optically anisotropic layer was formed. It is understood that the adhesion between the transparent support C1 of the optical compensation sheet and the optically anisotropic layer C2 is evaluated. It is 6 o'clock.

Hereinafter, examples and comparative examples of the third aspect of the present invention will be described.

[Example 3-1]

The third aspect of the present invention is described by taking the optical compensation film described below as an example; the optical compensation film is a substrate having a polymerized film made of deuterated cellulose as a polymer film substrate. The composition of the compound is an optical compensation film of the optically anisotropic layer formed by polymerization after the dish-like structural unit is horizontally aligned.

<Preparation of Cellulose Acetate Film (T1)> (Preparation of Cellulose Acetate Solution) The following composition was placed in a mixing tank, and the components were dissolved by stirring to prepare a cellulose acetate solution A.

Composition of cellulose acetate solution A

(Preparation of a matting agent solution) 20 parts by mass of vermiculite particles having an average particle diameter of 16 nm (AEROSIL R972, manufactured by Erosud Co., Ltd., Japan) and 80 parts by mass of methanol were thoroughly stirred and mixed for 30 minutes. It is prepared into a dispersion of vermiculite particles. This dispersion liquid was placed in a dispersing machine together with the following composition, and further stirred for 30 minutes or more, and each component was dissolved to prepare a matting agent solution.

Composition of matting agent solution

(Preparation of Additive Solution) The following composition was placed in a mixing tank, stirred while being heated, and each component was dissolved to prepare a cellulose acetate solution.

Composition of additive solution

(Production of Cellulose Acetate Film) 94.6 parts by mass of the above cellulose acetate solution A, 1.3 parts by mass of the matting agent solution, and 4.1 parts by mass of the additive solution were separately filtered and mixed, and flowed using a belt casting machine. Delay. In the above composition, the mass ratio of the compound which reduces optical anisotropy and the wavelength dispersion adjusting agent to cellulose acetate is 12% and 1.2%, respectively. When the residual solvent content was 30% by mass, the film was peeled off from the belt and dried at 140 ° C for 40 minutes to produce a long-length cellulose acetate film T1 having a thickness of 80 μm. The in-plane retardation (Re) of the obtained film was 1 nm (the slow phase axis was perpendicular to the longitudinal direction of the film), and the retardation (Rth) in the thickness direction was -1 nm.

The dielectric heating roller having a temperature of 60 ° C was passed through the film prepared above, and the surface temperature of the film was raised to 40 ° C, and then a bar coater was used to apply a base having the following composition at a coating amount of 14 mL/m ² . Solution A was retained for 10 seconds under a steam-type far infrared ray (manufactured by Noritak Co., Ltd.) heated to 110 °C. Next, 3 mL/m ² of pure water was applied using the same bar coater. The film temperature at this time was 40 °C. Next, the water was washed with a water jet machine and water-cut by an air knife was repeated three times, and then dried in a drying zone at 70 ° C for 2 seconds to be dried, and alkalized.

<Production of Optical Compensation Film F11> (Production of Optically Isotropic Layer) The surface of the long-sized fluorinated cellulose film (T1) prepared as described above was subjected to alkalization treatment, and coated with #14. The alignment film coating liquid of the following composition was continuously applied to the machine. The film was dried by a warm air of 60 ° C for 60 seconds, and further dried at a temperature of 100 ° C for 120 seconds to form an alignment film.

The coating liquid (S1) containing the discotic liquid crystalline compound having the following composition was continuously applied onto the alignment film produced above by a #6.0 line coater. The film was transported at a speed of 20 meters per minute. The solvent was dried by continuously heating from room temperature to 80 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the discotic liquid crystalline compound. The temperature of the film was kept at 90 ° C, and UV light of 500 mJ/cm ^{2 was} irradiated with a high-pressure mercury lamp to fix the alignment of the liquid crystal compound to form an optical anisotropic layer B1 to prepare an optical compensation film F11-200.

An automatic complex refractometer (KOBRA-21ADH, an object obtained by peeling off only the optically anisotropic layer containing the discotic liquid crystalline compound from the optical compensation film F11-200 produced and the optical compensation film F11-200. The prince measuring machine (manufactured by the company) was used to measure optical characteristics. Re measured at a wavelength of 590 nm was 2 nm, and Rth was 200 nm. Further, in the optical compensation film F1, only Re of the optical anisotropic layer was 0 nm, and Rth was 200 nm. Further, it was confirmed that the optically anisotropic layer in which the disc-shaped liquid crystal structure unit is substantially horizontally aligned with respect to the film surface has been formed.

Further, the film thickness of the optically anisotropic layer was 2.65 μm. The refractive index anisotropy was 0.075.

In the optical compensation film F11-200 produced as described above, the thickness of the coating film was changed so that Rth became 180 nm, 160 nm, or 140 nm, and films F11-180, F11-160, and F11-140 were produced, respectively. .

<Production of Optical Compensation Film F12> Commercially available cellulose acetate (Fujitack TD80UF, manufactured by Fuji Photo Film Co., Ltd., Re: 3 nm, Rth: 45) is used for the optical compensation film F11-200 produced as described above. In place of the deuterated cellulose film (T1), the thickness of the optically anisotropic layer was adjusted so that Rth became 200 nm, and the film F12-200 was produced.

Further, with respect to the optical compensation film F12-200 produced as described above, the thickness of the coating film was changed so that Rth became 180 nm, 160 nm, or 140 nm, and the film F12-180 was separately produced. F12-160, F12-140.

<Production of Optical Compensation Film F21> In the same manner as the optical compensation film F11-200, an alignment film was formed on the cellulose-deposited film (T1), and the composition was continuously applied on the alignment film by a #6.0 line coater. A coating liquid (S2) of a discotic liquid crystalline compound. The film was transported at a speed of 20 meters per minute. The solvent was dried by continuously heating from room temperature to 90 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the discotic liquid crystalline compound. The temperature of the film was kept at 90 ° C, and UV light of 500 mJ/cm ^{2 was} irradiated with a high-pressure mercury lamp, and the alignment of the liquid crystal compound was fixed to form an optical anisotropic layer B2 to prepare an optical compensation film F21-200.

From the optical compensation film F21-200 produced and the optical compensation film F21-200, only the optically anisotropic layer containing the discotic liquid crystalline compound was peeled off, and an automatic complex refractometer (KOBRA-21ADH, The prince measuring machine (manufactured by the company) was used to measure optical characteristics. Re measured at a wavelength of 590 nm was 2 nm, and Rth was 200 nm. In addition to the optical compensation film F1, only Re of the optically different direction layer was 0 nm, and Rth was 200 nm. Further, it was confirmed that an optically anisotropic layer in which the discotic liquid crystalline molecules are substantially horizontally aligned with respect to the film surface has been formed.

Further, the film thickness of the optically anisotropic layer was 2.2 μm. The refractive index anisotropy was 0.091.

In the optical compensation film F21-200 produced as described above, the thickness of the coating film was changed so that Rth became 180 nm, 160 nm, and 140 nm, and films F21-180, F21-160, and F21-140 were produced, respectively. .

<Production of Optical Compensation Film F22> Commercially available cellulose acetate (Fujitack TD80UF, Fuji Photo Film Co., Ltd., Re: 3 nm, Rth: 45) is used for the optical compensation film F21-200 produced as described above. In place of the deuterated cellulose film (T1), the thickness of the optically anisotropic layer was adjusted so that Rth became 200 nm, and the film F21-200 was produced.

Further, with respect to the optical compensation film F22-200 produced as described above, the thickness of the coating film was changed so that Rth became 180 nm, 160 nm, or 140 nm, and films F22-180 and F22- were respectively produced. 160, F22-140.

<Preparation of Optical Compensation Film F31> In the same manner as the optical compensation film F11-200, an alignment film was formed on the cellulose-deposited film (T1), and on the alignment film, a disk having the following composition was continuously applied by a wire coater. A coating liquid of a liquid crystal compound (S3). The film was transported at a speed of 20 meters per minute. The solvent was dried by continuously heating from room temperature to 90 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the discotic liquid crystalline compound. The temperature of the film was kept at 90 ° C, and UV light of 500 mJ/cm ^{2 was} irradiated with a high-pressure mercury lamp to fix the alignment of the liquid crystal compound to form an optical anisotropic layer B3 to prepare an optical compensation film F31-200.

In the optical compensation film F31-200 produced as described above, the thickness of the coating film was changed so that Rth became 180 nm, 160 nm, and 140 nm, and films F31-180, F31-160, and F31-140 were produced, respectively. .

<Production of Optical Compensation Film F32> Commercially available cellulose acetate (Fujitack TD80UF, manufactured by Fuji Photo Film Co., Ltd., Re: 3 nm, Rth: 45) is used for the optical compensation film F31-200 produced as described above. In place of the deuterated cellulose film (T1), the thickness of the optically anisotropic layer was adjusted so that Rth became 200 nm, and the film F31-200 was produced.

Further, with respect to the optical compensation film F32-200 produced as described above, the thickness of the coating film was changed so that Rth became 180 nm, 160 nm, or 140 nm, and films F32-180 and F32- were respectively produced. 160, F32-140.

The results of the optical compensation film produced above are shown in Table 3-1.

From the above results, it is understood that Rth/d can be greatly improved by using the disc-like compound represented by the general formula (1).

[Example 3-2]

The above-mentioned optical compensation film (F11-200) and Fujitack TD80UF were alkalized, and a polyvinyl alcohol-based adhesive was attached to both surfaces of the polarizing film by a roll-to-roller to prepare a polarizing plate ( P11-200). At this time, the optical compensation layer of the optical compensation film faces the outer side of the polarizing plate.

The other optical compensation film shown in Table 3-1 was also produced into a polarizing plate in the same manner as in P11-200.

[Example 3-3]

<Production of Liquid Crystal Display Device> (Production of Vertical Alignment Liquid Crystal Cell) 1% by weight of octadecyldimethylammonium chloride (coupling agent) was added to an aqueous solution of 3 wt% of polyvinyl alcohol. This was spin-coated on a glass substrate with an ITO electrode, and heat-treated at 160 ° C, followed by rubbing treatment to form a vertical alignment film. The rubbing treatment is carried out in such a manner that two glass substrates are oriented in opposite directions. The two glass substrates were combined in such a manner that the cell gap (d) became about 5.0 μm. A liquid crystal compound (Δn: 0.06) mainly composed of an ester system and an ethane group was injected into the cell gap to prepare a vertical alignment liquid crystal cell A. The product of Δn and d is 300 nm.

(Preparation of the upper polarizing plate) The polycarbonate film "Pure Ace WR" manufactured by Teijin Chemical Co., Ltd. was heat-reduced to near Tg, and the second optical compensation was obtained in which Re was 120 nm and Rth was 78 nm. Film A. A cylindrical polyvinyl alcohol film having a thickness of 80 μm continuously dyed in an aqueous iodine solution was stretched 5 times in the transport direction and dried to obtain a long polarizing film. The second optical compensation is applied to the surface of one side of the polarizing film by using a polyvinyl alcohol-based adhesive so that the transmission axis of the polarizing film and the slow axis of the second optical compensation film A are parallel. Film A; on the other side, a polyvinyl alcohol-based adhesive was used, and a commercially available cellulose acetate film (Fujitack TD80UL, Fuji Photo Film Co., Ltd.) was continuously attached thereto. It is made into the upper polarizing plate (P1).

(Incorporating the polarizing plate) With respect to the laminated angle of each film, when the left-right direction when viewed from above the display device is used as a reference (0°), as shown in FIG. 2, the polarizing film is absorbed by the axis 104 (at In the first drawing, the axis angle of 15) is set to 90°, and the angles of the protective film slow-phase axes 102 and 106 are set to 90°. The lower polarizing plate produced as described above is incorporated in a liquid crystal display device such that an optically anisotropic layer (10 in FIG. 1) is in contact with a liquid crystal cell substrate (8 in FIG. 1). .

Further, between the upper polarizing plate (1 in Fig. 1) and the upper liquid crystal cell substrate (5 in Fig. 1), the upper polarizing plate is disposed so that the second optical compensation film comes out. At this time, the retardation axis of the second optical compensation film is configured such that it coincides with the transmission axis of the upper polarizing plate.

As shown in Table 2, a liquid crystal display device in which the optical compensation film of the third aspect of the present invention produced as described above was incorporated was produced.

With respect to the liquid crystal display device produced above, the light leakage in the front and oblique directions, the color shift and the unevenness when viewed from the front and the oblique direction were evaluated by the following methods, and are summarized in Table 3-2.

(1) Light leakage (front) is placed on the display box in the dark room, and the liquid crystal cell is placed in a state where the polarizing plate is not attached, so as to set the luminance meter at a distance of 1 meter from the normal direction (spectral radiance meter CS) -1000: manufactured by MINOLUTA Co., Ltd.) The brightness 1 was measured.

Next, each liquid crystal display device to which the polarizing plate was attached was placed on the same display case as described above, and the brightness 2 was measured in the same manner as described above to indicate that the ratio of the brightness to the brightness 1 was light leakage.

(2) Light leakage (oblique direction) is placed on the display box in the dark room, and the liquid crystal cell is placed in a state where the polarizing plate is not attached, and the rubbing direction of the liquid crystal cell is used as a reference, and the setting is in the 45-degree orientation in the left direction. A luminance meter (measured by a spectroradiometer CS-1000: manufactured by MINOLUTA Co., Ltd.) at a distance of 1 m in the direction of 60 degrees from the normal direction of the liquid crystal cell was measured.

Next, each liquid crystal display device to which the polarizing plate was bonded was placed on the same display case as described above, and the brightness 2 was measured in the same manner as described above to indicate that the brightness was leaked obliquely with respect to the luminance of 1 of 100.

(3) The color shift (front) in the black display is placed on the display box set in the dark room, and the liquid crystal cell in the state in which the polarizing plate is attached is placed, and the liquid crystal cell is observed at a distance of 1 m from the normal direction, as described below. The benchmark evaluates the color and its intensity.

○: A specific color taste cannot be seen. ○ Δ: A slight specific color odor was observed. △: A little specific color smell was observed. ×: A specific color taste can be clearly seen.

(4) The color shift (oblique direction) in the black display is set on the display box in the dark room, and the liquid crystal cell in the state in which the polarizing plate is attached is placed, and the rubbing direction of the liquid crystal cell is used as a reference, and 45 degrees from the left direction The degree of orientation was observed at a distance of 1 m from the normal direction of the liquid crystal cell at 60 degrees, and the color shift at the time of black display was evaluated on the same basis as the above (3).

(5) The unevenness is set on the display box in the dark room, and the liquid crystal cell 1 in a state in which the polarizing plate is not attached is placed in such a manner that the substrate on which the electrode is formed is on the side of the display case, and the rubbing direction of the liquid crystal cell is made. For the reference, the angle was measured at a distance of 45 degrees from the left direction and at a distance of 1 meter from the normal direction of the liquid crystal cell, and the unevenness was evaluated according to the following criteria.

○: Uncertainty was not confirmed. ○ △: slight unevenness occurred. △: Partially visible unevenness. ×: Unevenness can be seen in all aspects.

From the results of Table 3-2, the following things are obvious.

In the liquid crystal display device using the liquid crystal cell A, when the hysteresis Rth in the thickness direction of each optical compensation film is 180 nm, the light leakage in the front side and the oblique direction is the least, and the color taste is small when viewed from the front side and the oblique direction. Optimal optical properties.

In each of the optical compensation films, the optical characteristics of the T1 having an Rth of 0 nm were good as compared with those of the TD80UF having a Rth of 45 nm using a polymer film.

In general, the higher the Rth of the optically anisotropic layer and the thicker the film thickness, the more likely the unevenness is caused. By increasing the Rth/film thickness, the film thickness of the same Rth can be made thinner, and unevenness can be improved. By setting the Rth/film thickness of the optically anisotropic layer to 0.065 or more, it is possible to obtain a favorable phase in which the Rth of the optically anisotropic layer is not uneven even at 150 nm or more.

[Example 3-4]

Here, a method of increasing Rth/d by reducing the amount of UV irradiation will be described.

The coating liquid (S1) containing the above-described discotic liquid crystal display compound on the alignment film of F11-200 was continuously applied onto the alignment film prepared above by a #6.0 line coater. The film was transported at a speed of 20 meters per minute. The solvent was dried by continuously heating from room temperature to 80 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the discotic liquid crystalline compound. The temperature of the film was kept at 80 ° C, and UV light of 500 mJ/cm ^{2 was} irradiated with a high-pressure mercury lamp, and the alignment of the liquid crystal compound was fixed to form an optical anisotropic layer to prepare an optical compensation film F51.

With respect to the optical compensation film F51 produced above, the amount of irradiation of the UV light was changed in the manner shown in Table 3-3 to prepare F52 to F54.

The coating liquid (S4) containing the above-described discotic liquid crystal display compound on the alignment film of F11-200 was continuously applied onto the alignment film prepared above by a #6.0 line coater. The film was transported at a speed of 20 meters per minute. The solvent was dried by continuously heating from room temperature to 80 ° C, and then heated in a drying zone at 120 ° C for 90 seconds to align the discotic liquid crystalline compound. The temperature of the film was kept at 80 ° C, and UV light of 500 mJ/cm ^{2 was} irradiated with a high-pressure mercury lamp, and the alignment of the liquid crystal compound was fixed to form an optical anisotropic layer to prepare an optical compensation film F61.

With respect to the optical compensation film F61 produced as described above, the amount of irradiation of the UV light was changed in the manner shown in Table 3-3 to prepare F62 to F64.

Further, the coating liquid used for the optical compensation films F51 to F54 is changed from the disc-like liquid crystal compound (S1) to (S2) to form the films F71 to F74.

In addition, the coating liquid used for the optical compensation films F51 to F54 is changed from the disk-shaped liquid crystal compound (S1) to (S5) to form films F81 to F84.

The optical compensation films F51 to 54, F61 to 64, F71 to 74, and F81 to F84 produced above were evaluated in the same manner as in Table 3-1, and the results are shown in Table 3-3.

Further, the adhesion test was carried out by the following method.

(6) Adhesion evaluation On the surface of the side of the antireflection film sample having the low refractive index layer, a cutting blade was cut into a checkerboard shape of 11 vertical and 11 crosswise, and a total of 100 square squares were drawn. Grid, press the polyester adhesive tape (No. 31B) made by Nitto Denko Co., Ltd. for adhesion test. The presence or absence of peeling was visually observed, and the following four evaluations were performed.

◎: It was confirmed that all of the 100 squares were not peeled off. ○: Among the 100 squares, it was confirmed that the peeling was within 2 squares. △: Among 100 squares, it was confirmed that the peeling was 3 to 10 cells. ×: Among 100 squares, it was confirmed that the peeling was more than 10 cells.

From the results of Table 3-3, the following facts are obvious.

When the UV irradiation amount is reduced, Rth/d can be increased. At this time, the adhesion tends to deteriorate as the amount of UV irradiation decreases. However, when a polymerization initiator A having a photosensitive region of 330 nm to 450 nm and generating a halogen radical is used, it is difficult to cause The deterioration of the adhesion. Therefore, in order to increase Rth/d, a preferred embodiment is to use a polymerization initiator A having a photosensitive region of from 330 nm to 450 nm to produce a halogen radical.

Further, from the comparison of F71 to F74 and F81 to F84, when the amount of UV irradiation is reduced, Rth/d can be increased. In this case, the adhesion tends to deteriorate as the amount of UV irradiation decreases. However, a polyfunctional monomer having a polymerizable group having four or more functional groups is used as the polyfunctional monomer (F71 to F74). It is also difficult to cause deterioration in adhesion than those using a trifunctional polyfunctional monomer (F81 to F84). Therefore, in order to increase Rth/d, a preferred embodiment is to use a polyfunctional monomer having a polymerizable group having four or more functional groups.

In the optical compensation film F71, the amount of the liquid crystalline compound (II) and the polyfunctional monomer DPHA of the coating liquid (S2) containing the liquid crystal compound is changed as shown in Table 3-4. F75~F77.

In the optical compensation film F81, the amount of the liquid crystal compound (II) and the polyfunctional monomer V#360 of the coating liquid (S5) containing the liquid crystal compound is changed according to Table 3-4. F85~F87.

From the results of Table 3-4, the following facts are obvious.

When the amount of the polyfunctional monomer contained is lowered, Rth/d can be increased. In this case, as the amount of the polymer decreases, the adhesion tends to deteriorate. However, a polyfunctional monomer having a tetrafunctional or higher polymerizable group is used as the polyfunctional monomer (F71 and F75 to F77). It is harder to cause deterioration in adhesion than those using a trifunctional polyfunctional monomer (F81 and F85 to F87). Therefore, in order to increase Rth/d, a preferred embodiment is to use a polyfunctional monomer having a polymerizable group having four or more functional groups.

1. . . Upper polarizer

2. . . Lower polarizer

3. . . Uniaxial or biaxial optical anisotropic layer

4. . . The direction of the optical axis of the uniaxial or biaxial optical anisotropic layer

5. . . Liquid crystal cell electrode substrate

6. . . Upper substrate alignment control direction

7. . . Liquid crystalline molecule

8. . . Liquid crystal cell electrode substrate

9. . . Lower substrate alignment control direction

10. . . Optical anisotropic layer (optical anisotropic layer of optical compensation film of the present invention)

14. . . Lower polarizer

15. . . The direction of the absorption axis of the lower polarizer

101. . . Polarizer protective film

102. . . The direction of the retardation axis of the protective film of the polarizing plate

103. . . Polarizing plate polarizing film

104. . . Polarizing plate absorption axis direction

105. . . Polarizer protective film

106. . . The direction of the retardation axis of the protective film of the polarizing plate

Fig. 1 is a schematic view showing an example of a liquid crystal display element of the present invention.

Fig. 2 is a schematic view showing an example of a polarizing plate of the present invention.

Claims (32)

An optical compensation film which is an optical compensation film having at least one layer of an optically anisotropic layer on a polymer film, wherein the in-plane hysteresis in 590 nm is 0 to 10 nm and the hysteresis in the thickness direction in 590 nm is 100 to 300. Nano, and the aforementioned film satisfies the following relationship (1-1) to (1-3); formula (1-1) - 50 nm ≦ Rth (590) ≦ 150 nm, formula (1-2) - 5 nm ≦ Rth ( 450) - Rth (550) Formula (1-3) 0 ≦ Re (590) ≦ 10 nm The polymer film further satisfies the following relationship (1-5), formula (1-5) 1.0 < Rth (450) / Rth (550) < 4.0 and the optical compensation film further satisfies the following relationship (1-6), and the formula (1-6) is 1.06 ≦ Rth (450) / Rth (550) < 1.30. The optical compensation film of claim 1, wherein the film further satisfies the following relationship (1-4); formula (1-4) 20 nm ≦ Rth (590) ≦ 120 nm. The optical compensation film of claim 1, wherein the film comprises a deuterated cellulose film mainly composed of deuterated cellulose. The optical compensation film according to claim 1, wherein the polymer film contains 1% by mass to 30% by mass of a polymer film of a wavelength dispersion controlling agent having a maximum absorption in a wavelength region of from 250 nm to 400 nm. The optical compensation film of claim 1, wherein the polymer film contains a polymer film of at least one of the compounds represented by the following formula (B-1); In the formula, R ¹ and R ² each represent an alkyl group or an aryl group. The optical compensation film according to claim 1, wherein the polymer film contains a deuterated cellulose film mainly composed of deuterated cellulose having a mercapto substitution degree of 2.90 to 3.00. The optical compensation film according to claim 1, wherein the polymer film contains a deuterated cellulose film mainly composed of a mixed fatty acid ester having a total thiol substitution degree of 2.70 to 3.00. The optical compensation film of claim 1, wherein the optically anisotropic layer satisfies the following formula (1-7): formula (1-7): 1.09 ≦ Rth (450) / Rth (550) ≦ 1.30. The optical compensation film according to claim 1, wherein the optically anisotropic layer is a layer formed by curing a polymerizable composition containing a discotic liquid crystal, and among the optically anisotropic layers, the aforementioned discotic liquid crystal It is fixed in a state in which the disk surface is aligned to be horizontal with respect to the layer. An optical compensation film according to claim 1, wherein the optically anisotropic layer is in a state of optically active chiral nematic (cholesteric) liquid crystal phase, and the liquid crystal is fixed by polymerization. A layer formed by polymerizing a composition. The optical compensation film of claim 1, wherein the optically anisotropic layer is a polymer layer formed by coating a polymer material, the polymer layer having a negative refractive index anisotropy and being in a normal direction of the layer Has an optical axis. For example, in the optical compensation film of claim 1, the optically anisotropic layer comprises a fluorine-containing surfactant. A polarizing plate having an optical compensation film according to any one of claims 1 to 12. An optical compensation film which is an optical compensation film having an optically anisotropic layer on a polymer film substrate, and an in-plane retardation (Re) of 590 nm is 0 to 10 nm, and a retardation in a thickness direction at 590 nm ( Rth) is 100 to 300 nm, and Rth/d (ratio of hysteresis in the thickness direction divided by film thickness) of the optically anisotropic layer is 0.065 to 0.16, and satisfies the following formula (3-1); (3-1) 1.03 ≦ Rth (450) / Rth (550) ≦ 1.30. For example, the optical compensation film of claim 14 wherein the optical anisotropic layer has an Rth/d of 0.085 to 0.16. The optical compensation film of claim 14, wherein the optically anisotropic layer satisfies the following formula (3-2); formula (3-2) 1.06 ≦ Rth (450) / Rth (550) ≦ 1.30. The optical compensation film of claim 14, wherein the optically anisotropic layer is formed of a polymerizable composition. The optical compensation film of claim 14, wherein the polymerizable composition contains a photopolymerization initiator, and the photoreceptor of the photopolymerization initiator is In the range of 330 nm to 450 nm, the photopolymerization initiator generates a halogen radical or a hydrocarbon radical having 8 or less atoms other than hydrogen. The optical compensation film of claim 14, wherein the polymerizable composition contains a polyfunctional monomer having four or more double bonds. The optical compensation film according to claim 14, wherein the polymerizable composition is a composition comprising a liquid crystalline compound having a polymerizable group, and among the optically anisotropic layers, the dish-like liquid crystal property The dish-like structural unit of the compound is horizontally aligned with respect to the surface of the polymer film substrate. The optical compensation film of claim 20, wherein the dish-like liquid crystalline compound is a compound represented by the following formula (I), [In the formula, A ¹ and A ² each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms; and Y represents a hydrogen atom; a halogen atom, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a fluorenyl group having 2 to 13 carbon atoms, or an alkylamino group having 1 to 12 carbon atoms, Or a fluorenyl group having 2 to 13 carbon atoms; or a bond between A ² and Y to form a five-membered ring or a six-membered ring; and Z-based as a halogen atom or an alkyl group having 1 to 12 carbon atoms; An alkoxy group having 1 to 12 carbon atoms, a fluorenyl group having 2 to 13 carbon atoms, an alkylamino group having 1 to 12 carbon atoms, or a decyloxy group having 2 to 13 carbon atoms; Is a divalent linkage selected from the group consisting of -O-, -CO-, -S-, -NH-, alkylene, alkenyl, alkynyl, aryl, and the like. Base; Q represents a polymerizable group; a represents an integer from 1 to 4; and b represents an integer from 0 to (4-a). The optical compensation film of claim 17, wherein the polymerizable composition comprises an optically active nematic (cholesteric) liquid crystal compound. The optical compensation film of claim 14, wherein the optically anisotropic layer comprises a polymer containing a fluorine-based aliphatic group. The optical compensation film of claim 14, wherein the optically anisotropic layer comprises a polymer material having a negative refractive index anisotropy at the time of coating and having an optical axis in a normal direction of the surface. The optical compensation film of claim 14, wherein the retardation of the thickness direction of the polymer film substrate is -25 to 25 nm. An optical compensation film according to claim 14 wherein the polymer film is a deuterated cellulose film. A polarizing plate having an optical compensation film according to any one of claims 1 to 26. A liquid crystal display device having two polarizing films having absorption axes perpendicular to each other and a pair of substrates and a liquid crystal layer containing liquid crystal molecules sandwiched between the two polarizing plates, and Not applied In the non-driving state in which an external electric field is applied, the liquid crystal molecules are aligned to a liquid crystal cell in a direction of 90±10° with respect to the substrate, and the optical device according to any one of claims 1 to 26. The compensation film, or one of the aforementioned polarizing plates, is a polarizing plate as in claim 27 of the patent application. The liquid crystal display device of claim 28, wherein the liquid crystal display device further has a second optical compensation film, wherein the second optical compensation film is composed of a polymer stretch film, and has a front side hysteresis and a thickness direction retardation system. The following formula (8) and the following formula (9) are satisfied: Formula (8) 70 ≦ Re (550) ≦ 180 Formula (9) 30 ≦ Rth (550) ≦ 140. The liquid crystal display device of claim 28, wherein the second optical compensation film satisfies the following formula (10): formula (10) 0.7 ≦ Re (450) / Re (550) ≦ 1.0. The liquid crystal display device of claim 29, wherein the second optical compensation film is made of a deuterated cellulose film, Any of an olefinic film, a polycarbonate film, a polyester film, and a polyfluorene film. The liquid crystal display device of claim 29, wherein the second optical compensation film is such that its in-plane retardation axis is vertically laminated on one side of the polarizing film with respect to the absorption axis of the polarizing film.